Biology of Hevea rubber by P.M. Priyadarshan

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By P.M. Priyadarshan

In the second one version of this booklet, the starting place, maintenance and latex harvest from the Hevea rubber tree are handled succinctly. New chapters were integrated on Propagation platforms and Genetic assets. the significance of Heterozygosis and Breeding is a brand new topic for the part on Breeding. a brand new bankruptcy on Genomics and Molecular Breeding that makes a speciality of the newest developments on gene mapping, marker assisted choice and stimulation has been additional. finally, ‘textboxes’ that spotlight issues and issues of vital curiosity are integrated within the new addition.

Natural rubber has been an important commodity not just for the tire but additionally for greater than 50,000 items that holds elasticity as an characteristic. The best resource of average rubber around the world is Hevea brasiliensis. Hevea rubber tree is a superb instance of the way a soil-tree-atmosphere approach can paintings in tandem. The retrieval of rubber via ‘injuring’ the tree on exchange days or as soon as in 3 days or as soon as in seven days, is certainly a distinct association universally that guarantees source of revenue to the planter virtually all year long. each molecule of rubber is the result of meticulous biochemical changes.  accordingly the biology of Hevea rubber tree itself is a topic that aggregates technological know-how and expertise for the belief of its business utility.

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Hurov, this process involves a young stock plant and budwood. Stock seedlings would be 2–8 months old and the budwood 6–8 weeks old. Buds found above the scale leaves of the shoots alone are used for grafting. For proper peeling of the bud patch, harvesting should be done when the leaves are copper brown to dark green. 5 cm above the collar region. The lower ends of these cuts are joined by a horizontal cut and a few minutes allowed for the cessation of latex flow. The flap of bark thus separated out is then gently lifted upwards exposing the bud-grafting panel.

However, due to fruit-load compensation, when the optimum number of fruits is set, the pistillate flowers arising later may not fulfil their reproductive role. Only 25% of total pistillate flowers form fruits, and of these only about 25% attain maturity. The total number of fruits set will only be < 5% (Fig. 3). , 1987). Selfing, or the crossing of related parents, of an outbreeding taxon could result in inbreeding depression, Fertilization No ovules fertilized All ovules fertilized (25%) Seeds Premature shedding (50%) Healthy endosperm Fruit-load compensation Premature shedding (25%) Partially developed endosperm No seeds Fruits (< 5%) Germination (for seeds resulting from seasonal flowering) (season: March–April) Reduced germination of seeds because of: (1) embryo–endosperm interactions (2) lack of environmental stimuli Reduced germination (for seeds resulting from off-season flowering (August–September) Fig.

8%. 10 Root heterogeneity and stock–scion interactions A major part of rubber breeding efficiency can be attributed to the grafting technique which enables the multiplication of elite genotypes at the level of the budgrafted part (aerial part of the tree) and which determines the use of clones as the almost exclusive varietal type in rubber cropping. Unfortunately, cloning the whole tree (aerial part and roots) for the development of single-component clonal trees by the cutting technique (self-rooted marcots and mist-propagated cuttings) generates a high ratio of uprooting due to lack of taproot and inadequate anchorage.

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