By P.M. Priyadarshan
In the second one variation of this e-book, the foundation, maintenance and latex harvest from the Hevea rubber tree are handled succinctly. New chapters were integrated on Propagation structures and Genetic assets. the significance of Heterozygosis and Breeding is a brand new subject for the part on Breeding. a brand new bankruptcy on Genomics and Molecular Breeding that makes a speciality of the most recent developments on gene mapping, marker assisted choice and stimulation has been extra. finally, ‘textboxes’ that spotlight issues and themes of important 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 leading resource of traditional rubber world wide is Hevea brasiliensis. Hevea rubber tree is a wonderful instance of the way a soil-tree-atmosphere process 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 nearly all year long. each molecule of rubber is the result of meticulous biochemical changes. hence the biology of Hevea rubber tree itself is a topic that aggregates technological know-how and expertise for the conclusion of its commercial utility.
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Additional resources for Biology of Hevea rubber
5 cm are ideal for grafting. Stocks should be grafted when the bark peels off very easily. Test peeling of a small patch of bark 15 cm above the base is the surest method of assessing the peeling quality of the bark. Brown buds are usually obtained from brown budwood produced by budgrafted plants raised as source bush nurseries (SBNs). Buds found in the axils of fallen leaves are generally utilized for bud grafting. Budwood should be collected when the top whorl of leaves has fully expanded but not hardened to ensure proper peeling of the bark and high bud-grafting success.
There used to be a yield depression during defoliation and more markedly during refoliation. In areas experiencing a dry period, the duration of wintering tends to be short and refoliation is completed fast, thus minimizing yield reduction. Most of the non-traditional rubber-growing areas above 15°N fall under this category. For instance, trees of north-east India tend to be completely leaﬂess for 10–15 days. There are marked differences between clones in wintering behaviour. A few tend to shed and replace part of their foliage simultaneously over a relatively 26 Chapter 3 long period and may thus show no very obvious signs of wintering, while at the other extreme some become completely leaﬂess for a time.
Three-part stumps are produced by proper pruning of the stem and roots of crown-bud grafted plants raised in the nursery. To produce a three-part stump, a bud-grafted plant in the nursery is ﬁrst cut back above the bud patch as in the case of stumped bud grafts. When the scion grows to a height of 240 cm, crown bud grafting is done below the top whorl of leaves. 5 cm above the crown bud. The crown bud grows and produces the new crown shoot. Stock–scion interaction A grafted plant comprises a root system contributed by the stock plant and the shoot system by the scion.
Biology of Hevea rubber by P.M. Priyadarshan