Tissue Culture Banana

The propagation of a plant by using a plant part or single cell or group cell in a test tube under very controlled and hygienic conditions is called "Tissue Culture".

Banana is a globally important fruit crop with 97.5 million tones of production. In India it supports livelihood of million of people. With total annual production of 16.91 million tones from 490.70 thousand ha., with national average of 33.5 T/ha. Maharashtra ranks first in production with 60 T/ha. Banana contributes 37% to total fruit production in India.

Banana is one of the major and economically important fruit crop of Maharashtra. Banana occupy 20% area among the total area under crop in India. Maharashtra ranks second in area and first in productivity in India. Jalgaon is a major Banana growing district in Maharashtra which occupy 50,000 hectares area under Banana. But most of Banana is grown by planting suckers. The technology development in agriculture is very fast, it results in developing Tissue Culture Technique.

Banana is basically a tropical crop, grows well in temperature range of 13ºC – 38ºC with RH regime of 75-85%. In India this crop is being cultivated in climate ranging from humid tropical to dry mild subtropics through selection of appropriate varieties like Grandnaine. Chilling injury occurs at temperatures below 12ºC. The normal growth of the banana begins at 18ºC, reaches optimum at 27ºC, then declines and comes to a halt at 38ºC. Higher temperature causes sun scorching. High velocity wind which exceeds 80 km phrs damages the crop.

Soil for banana should have good drainage, adequate fertility and moisture. Deep, rich loamy soil with pH between 6-7.5 are most preferred for banana cultivation. Ill drained, poorly aerated and nutritionally deficient soils are not suitable for banana. Saline solid, calcareous soil are not suitable for Banana cultivation. Avoided soil of low laying areas, very sandy & heavy black cotton with ill drainage.

A soil that is not too acidic & not too alkaline, rich in organic material with high nitrogen content, adequate phosphorus level and plenty of potash are good for banana.

In India banana is grown under diverse conditions and production systems. Selection of varieties, therefore is based on a large number of varieties catering to various kinds of needs and situations. However, around 20 cultivars viz. Dwarf Cavendish, Robusta, Monthan, Poovan, Nendran, Red banana, Nyali, Safed Velchi, Basarai, Ardhapuri, Rasthali, Karpurvalli, Karthali and Grandnaine etc..

Grandnaine is gaining popularity and may soon be the most preferred variety due to its tolerance to biotic stresses and good quality bunches. Bunches have well spaced hands with straight orientation of figures, bigger in size. Fruit develops attractive uniform yellow colour with better self life & quality than other cultivars.

Prior to planting banana, grow the green manuring crop like daincha, cowpea etc. and burry it in the soil. The land can be ploughed 2-4 times and leveled. Use ratovator or harrow to break the clod and bring the soil to a fine tilt. During soil preparation basal dose of FYM is added and thoroughly mixed into the soil.
A pit size of 45cm x 45cm x 45cm is normally required. The pits are to be refilled with topsoil mixed with 10 kg of FYM (well decomposed), 250 gm of Neem cake and 20 gm of conbofuron. Prepared pits are left to solar radiation helps in killing the harmful insects, is effective against soil borne diseases and aids aeration. In saline alkali soil where PH is above 8 Pit mixture is to be modified to incorporate organic matter.

Addition of organic matter helps in reducing salinity while addition of purlite improves, porosity and aeration. Alternative to planting in pits is planting in furrows. Depnding on soil strata one can choose appropriate method as well as spacing and depth at which plant is required to be planted.

Sword suckers weighing approximately 500-1000 gm are commonly used as propagating material. Suckers generally may be infected with some pathogens and nematodes. Similarly due to the variation in age and size of sucker the crop is not uniform, harvesting is prolonged and management becomes difficult.
Therefore, in-vitro clonal propagation i.e. Tissue culture plants are recommended for planting. They are healthy, disease free, uniform and authentic. Properly hardened secondary seedlings are only recommended for planting

• True to the type of mother plant under well management.
• Pest and disease free seedlings.
• Uniform growth, increases yield.
• Early maturity of crop - maximum land use is possible in low land holding country like India.
• Round the year planting possible as seedlings are made available throughout the year.
• Two s uccessive ratoons are possible in a short duration which minimizes cost of cultivation.
• No staggered harvesting.
• 95% - 98% plants bear bunches.
• New varieties can be introduced and multiplied in a short duration.

Planting of tissue culture Banana can be done throughout  the year except when the temperature is too low or too high. Facility of drip irrigation system is important. There are two important seasons in Maharashtra, India;
Mrig Baug (Kharif) Month of planting June - July.
Kande Baug (Rabi) Month of planting October - November.

Crop Geometry

Traditionally banana growers plant the crop at 1.5m x 1.5m with high density, however plant growth and yields are poor because of competition for sunlight. Various trials are conducted at Jain Irrigation System R&D farm with Grandnaine as cultivar. And then suitable spacing of 1.82m x 1.52m is being recommended, it accommodates 1452 plants per acre (3630 plants per hectare) keeping row direction North-South with wide spacing 1.82m between the rows. The region like north India, coastal belt and where humidity is very high and temp falls down upto 5-7ºC, the planting distance should not be less than 2.1m x 1.5m.

Crop Geometry var. Grand Naine

Polybags is separated from the plant without disturbing the root ball of the plant and then plants are planted in the pits keeping the pseudo-stem 2cm below the ground level. Soil around the plant is gently pressed. Deep planting should be avoided.

Banana, a water loving plant, requires a large quantity of water for maximum productivity. But Banana roots are poor withdrawal of water. Therefore under Indian condition banana production should be supported by an efficient irrigation system like drip irrigation.
Water requirement of banana has been worked out to be 2000mm per Annum. Application of drip irrigation and mulching technology has reported improved water use efficiency. There is saving of 56% of water and increasing yield by 23-32% under drip.
Irrigate the plants immediately after planting. Apply sufficient water and maintain field capacity. Excess irrigation will lead to root zone congestion due to removal of air from soil pores, thereby affecting plant establishment and growth. And hence drip method is must for proper water management in Banana

Banana requires high amount of nutrients, which are often supplied only in part by the soil. Nutrient requirement has been worked out on all India basis is to be 20 kg FYM, 200gm N; 60-70gm P; 300gm K/plant. Banana requires heavy nutrition. Banana crop requires 7-8 Kg N, 0.7- 1.5 Kg P and 17-20 Kg K per metric tonne yield. Banana responds well to application of nutrients. Traditionally farmers use more of urea and less of phosphorous and potash.
In order to avoid loss of nutrients from conventional fertilizers i.e. loss of N through leaching, volatilization, evaporation and loss of P and K by fixation in the soil, application of water soluble or liquid fertilizers through drip irrigation (fertigation) is encouraged. A 25-30% increase in yield is observed using fertigation. Moreover, it saves labour and time and the distribution of nutrients is uniform.

The fertilizer schedule for tissue culture banana variety Grand Naine both in solid and water soluble form is given in the tables below:

Solid fertilizer schedule for Grand Naine Banana

Schedule is directive only and may change according to planting season and soil fertility status (Soil analysis)
 SSP = Single Super Phosphate, MOP = Muriate of Potash.

Water Soluble Solid fertilizers

Schedule of water soluble fertilizer application.

Schedule is directive only and may change according to planting season and soil fertility status (soil analysis).

The Root system of banana is superficial and easily damaged by cultivation, use of intercrop which is not desirable. However short durational crops (45-60 days) like mung, cowpea, daincha are to be considered as green manuring crops. Crops from cucurbitaceous family should be avoided as these carry viruses.

Weeding

Spraying of Glyphosate (Round up) before planting at the rate of 2 lit/ha is carried out to keep the plantation weed free. One or two manual weedings are necessary.

Micronutrient Foliar Spray

Combined foliar application of ZnSo4 (0.5%), FcSo4 (0.2%), CuSo4 (0.2%) and H3Bo3 (0.1%) can be adopted to improve morphological, physiological and yield attributes of banana. The micronutrient spray solution is prepared by dissolving the following in 100 lit. of water.

There are operation specific to banana crop which influence productivity and quality.

Desuckering

Removal of unwanted suckers is a critical operation in banana for reducing internal competition with mother plant.
Desuckering should be done regularly until shooting. However in areas where ratoon is also taken for the second crop, a follower is allowed after inflorescence has appeared and this should be managed that planting space is not disturbed. Follower should be opposite to the inflorescence. It should not be far apart from the main plant.

Deflowering

It consists of removal of the withered style and perianth. This is generally not practiced. Therefore, they remain attached to the fruit bunch & then removed after harvesting which is damaging to the fruits. It is therefore suggested that you remove them just after flowering.

Pruningof leaves

Rubbing leaves damages the fruit, therefore, such leaves should also be pruned during regular check. Older leaves and infected leaves also be pruned as required. Green leaves should not be removed.

Earthing up

Keep the soil loose by harrowing from time to time. Earthing up should be done at 3-4 months after planting i.e. raising the soil level around the base of the plant by 10-12”. It is better to prepare a raised bed and keep the drip line on bed 2-3” away from the plant. It also helps to protect plants from wind damage and production losses to some extent..

Removal of male buds

(Denavelling) Removal of male buds helps fruit development and increases bunch weight. Male buds are removed from the last 1-2 small hands with a clean cut keeping a single finger in the last hand.

Bunch Spray

Spray of monocrotophos (0.2%) after emergence of all hands takes care of the thrips. Thrips attack discolors the fruit skin and makes it unattractive.

Bunch Covering

Covering bunch using dried leaves of the plant is economical and prevents the bunch from direct exposure to sunlight. Bunch cover enhances quality of fruit. But in rainy season this practice should be avoided.
Sleeving of bunch is done to protect fruits against dust, spray residue, insect and birds. For this blue plastic sleeves are preferred. This also increases temperature around developing bunch and helps in early maturity.

Dehandling of false hands of bunch

In a bunch there are some incomplete hands which are not fit for quality produce. These hands should be removed soon after bloom. This helps in improving the weight of other hands. Sometimes the hand just above the false hand is also removed.

Propping

Due to heavy weight of bunch the plant goes out of balance and the bearing plant may lodge and production and quality are adversely affected. Therefore they should be propped with the help of two bamboos forming a triangle by placing them against the stems on the leaning side. This also helps in uniform development of bunch.

A large number of fungal, viral and bacterial diseases and insect pests and nematodes infest the banana crop and reduce production, productivity and quality. Summary details of major pest and diseases of banana along with control measures are given herewith:

Banana should be harvested at the physiological maturity stage for better post harvest quality. The fruit is climacteric and can reach consumption stage after ripening operation

Maturity indices

These are established on the basis of fruit shape, angularity, grade or diameter of the median figure of the second hand, starch content and number of days that have elapsed after flowering. Market preferences can also affect the decision for harvesting a slight or full mature fruit.

Removal of bunch

Bunch should be harvested when figures of second hand from top are 3/4 rounded with the help of sharp sickle 30cm above the first hand. Harvest may be delayed upto 100-110 days after opening of the first hand. Harvested bunch should generally be collected in well padded tray or basket and brought to the collection site. Bunches should be kept out of light after harvest, since this hastens ripening and softening.
For local consumption, hands are often left on stalks and sold to retailers.
For export, hands are cut into units of 4-16 fingers, graded for both length and girth, and carefully placed in polylined boxes to hold different weight depending on export requirements.

Post harvest operations

At collection site injured and over mature fruits are discarded and for local market bunches should be delivered through lorries or wagons. However, for more sophisticated and export market where the quality is predominant, bunches should be dehanded, fruits are cleared in running water or dilute sodium hypochlorite solution to remove the latex and treated with thiobendasole; air dried and graded on the basis of size of fingers as already stated, packed in ventilated CFB boxes of 14.5 kg capacity or as per requirement with polythene lining and pre-cooled at 13-15ºC temperature and at 80-90% RH.
Such material should than be sent under cool chain at 13ºC for marketing

The planted crop gets ready for harvest within 11-12 months of planting. First ratoon crop would be ready by 8-10 month from the harvesting of the main crop and second ratoon by 8-9 months after the second crop.

Thus over a period to 28-30 months, it is possible to harvest three crops i.e. one main crop and two ratoon crops. Under drip irrigation combined with Fertigation yield of Banana as high as 100 T/ha can be obtained with the help of tissue culture technique, even similar yield in the ratoon crops can be achieved if the crop is managed well.