Download Biology of Hevea rubber by P.M. Priyadarshan PDF

By P.M. Priyadarshan

In the second one variation of this ebook, the foundation, 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 specializes in the newest developments on gene mapping, marker assisted choice and stimulation has been extra. finally, ‘textboxes’ that spotlight issues and subject matters of vital curiosity are incorporated within the new addition.

Natural rubber has been an important commodity not just for the tire but in addition for greater than 50,000 items that holds elasticity as an characteristic. The major resource of average rubber all over the world is Hevea brasiliensis. Hevea rubber tree is a wonderful instance of ways a soil-tree-atmosphere method 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 special association universally that guarantees source of revenue to the planter nearly all year long. each molecule of rubber is the outcome of meticulous biochemical changes.  hence the biology of Hevea rubber tree itself is a topic that aggregates technology and expertise for the conclusion of its commercial utility.

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The hilum can be seen as a shallow, approximately circular depression on the ventral surface and the micropyle is adjacent to it. A papery integument lines the inner testa and encloses the endosperm, which fills the seed. The embryo is situated in the middle of the endosperm with the radicle pointing towards the micropyle. The two white, veined cotyledons are pressed against the endosperm and enclose the plumular end of the axis of the embryo. The endosperm, which forms 50–60% of the weight of the seed, contains semi-drying oil which can be used as a rather poor substitute for linseed oil.

A thin film of polythene is wound over the bud patch for waterproofing. After 21 days, the polythene is taken off. The bud patch gets attached to the stock permanently and becomes a part of it. The stock is then cut off above the bud-grafted portion and the grafted bud develops into a new shoot (scion) and then into a two-part tree. 32 Chapter 3 Depending on the colour and age of the buds, three main types of bud grafting are recognized. These are: (i) brown (conventional); (ii) green; and (iii) young bud grafts.

The viability of brown-bud grafted stumps can be retained for up to 30 days by packing them in boxes with wet sawdust (Premakumari and Nair, 1974). 40 Chapter 3 Poly-bag plants are raised from green bud grafts or brown bud grafts. The poly-bag plants are field planted usually at the two- to three-whorl stage. While transporting poly-bag plants, utmost care should be given to prevent any damage to the soil core. If the soil core is damaged, casualties may arise. Three-part stumps are produced by proper pruning of the stem and roots of crown-bud grafted plants raised in the nursery.

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