Variability in Wild Germplasm of Natural Rubber (Hevea brasiliensis Muell. Arg.)
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The high level of variability observed in this germplasm indicates its potential use in crop improvement programmes and for broadening the genetic base of Hevea.Abstract:
Abstract Para rubber (Hevea brasiliensis), a native of the Amazon forests of South America, is the chief source of natural rubber in the world. With the objective of broadening the original gene pool collected by Sir Henry Wickham in 1876, the International Rubber Research and Development Board (IRRDB) made a large collection of wild germplasm from Acre, Rondonia and Mato Grosso states of Brazil in 1981, which was distributed to various member countries including India for conservation and evaluation. In the present study, variability was assessed in a set of 195 Hevea accessions belonging to the wild gene pool in India, using 22 characterization descriptors and eight quantitative growth characters in the juvenile stage. The Shannon-Weaver diversity indices worked out for each of the 22 qualitative traits indicated a high level of diversity in the collection. The range of variation for quantitative traits viz., plant height (0.43 to 3.16 m), basal diameter (0.81 to 2.52 cm), number of whorls (1.23 to 5.48), inter-node length (4.11 to 45.26 cm), number of leaves (11.44 to 91.26), single leaf area (80.22 to 223.57 cm2), total leaf area (2356.00 to 14660.50 cm2) and leaf area index (0.24 to 1.47), also represented wide variability in the collection. The accessions were ranked for overall performance and top 10% were selected for early growth vigour. The high level of variability observed in this germplasm indicates its potential use in crop improvement programmes and for broadening the genetic base of Hevea.read more
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Journal ArticleDOI
Evaluation of Brazilian wild Hevea germplasm for cold tolerance: genetic variability in the early mature growth
G. Prabhakara Rao,P. C. Kole +1 more
TL;DR: The top 30 % of the potential accessions showing high growth vigour and early tappability under cold stress were identified and these ecotypes/selections have high potential value for the development of cold-tolerant clones for these regions and also in broadening the genetic base of the present-day cultivated rubber.
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Genetic diversity analyses of rubber tree genotypes based on UPOV descriptors
Isabela de Castro Sant’Anna,Cosme Damião Cruz,Lígia Regina Lima Gouvêa,Erivaldo José Scaloppi Junior,Rogério Soares de Freitas,Paulo de Souza Gonçalves +5 more
TL;DR: In this article, the authors compared different dissimilarity matrices and proposed a new way of calculating the distance matrix of multicategory descriptor traits; and analyzed the importance of multicategorical traits.
Agronomical characterisation of 1981 germplasm in Côte d'Ivoire: growth, production, architecture and leaf disease sensibility
Thierry Chapuset,Hyacinthe Legnaté,Amadou Doumbia,André Clément-Demange,Dominique Nicolas,J. Kéli +5 more
TL;DR: Les genotypes prospectes dans l'etat du Mato Grosso presentent un meilleur rendement and une meilleure architecture que ceux qui l'ont ete dans le Rondonia ou l'Acre, sont plus sensibles aux maladies de feuilles.
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Recent insights on gene expression studies on Hevea Brasiliensis fatal leaf fall diseases
TL;DR: In this paper , the expression patterns of commonly expressed genes upon fungi triggers were analyzed using RT-PCR, DDRT-based, Real-time qRT-based and RNA-Seq, and the identified genes with defence against fungi were pathogenesis-related genes such as β-1,3-glucanase and chitinase.
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Genetic variability and association of characters in the 1995 RRIM Hevea germplasm core collection for yield improvement
TL;DR: In this paper, the authors evaluated the extent of genetic variability in the 1995 Rubber Research Institute of Malaysia (RRIM) Hevea germplasm core collection to determine the correlation and the direct and indirect effects of morphological and bark structural characters on latex yield.
References
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Statistical and Biometrical Techniques in Plant Breeding
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Journal ArticleDOI
Geographical Patterns of Phenotypic Diversity in a World Collection of Durum Wheats1
TL;DR: The number of entries in the collection was very small from some areas known to be important sources of germplasm, pointing to the importance of intensifying efforts in exploration and conservation.
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Par Absorption and Its Relation to Above-Ground Dry Matter Production of Sitka Spruce
TL;DR: It was found that the above-ground dry matter production was proportional to the amount of PAR absorbed, irrespective of treatments, and the upper limit of biomass production of a Sitka spruce stand in Scotland was estimated to be 36thayear-1.
Agronomical characterisation of 1981 germplasm in Côte d'Ivoire: growth, production, architecture and leaf disease sensibility
Thierry Chapuset,Hyacinthe Legnaté,Amadou Doumbia,André Clément-Demange,Dominique Nicolas,J. Kéli +5 more
TL;DR: Les genotypes prospectes dans l'etat du Mato Grosso presentent un meilleur rendement and une meilleure architecture que ceux qui l'ont ete dans le Rondonia ou l'Acre, sont plus sensibles aux maladies de feuilles.