Attempts to evolve compact crown clones of Hevea brasiliensis
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TextPublication details: IRRDB International Rubber Conference 14-17 December 2011, Chiang Mai, Thailand.Subject(s): Summary: High yielding compact canopy clones of Hevea brasiliensis are beneficial to growers in resisting wind damage, favouring high density planting and deploying suitable intercrops to increase net income from the plantations. Genetic diversity for compact canopy trait in the available gene pool of Hevea is meagre except for a natural mutant (NM) selected from the seedling population. Utilization of NM was explored by using it as one of the parent in half-sib progeny selection approach. Four selected genotypes (compact, semi compact, intermediate and normal type) were evaluated in normal spacing (22 x 11 feet) along with the control (RRII 105). Trunk growth (cm), dry rubber yield (g/t/t) and canopy diameter/width (m) were assessed. Each types exhibited wide variability in terms of growth, dry rubber yield and crown compactness up to 17th year after planting. Girth canopy diameter and yield of four types (Compact: 58.5 cm, 1.2 m and 14.5 g/t/t; Semi Compact: 59.0 cm, 4.0 m and 8.1 g/t/t; Intermediate: 61.0 cm, 2.0 m and 34.8 g/t/t; Normal type: 78.7 cm, 5.5 m and 63.7 g/t/t, RRII 105: 63.3 cm, 4.6 m and 57.6 g/t/t) showed considerable variability. Intermediate crown type was found to be promising than its female parent in growth and yield, and modified crown type. This would be selected for further evaluation and confirmation in clonally replicated trials. Selection of clones with medium to high growth and compact canopy could maximize space utilization and better crop management practices such as high density planting and intercropping. The present study could identify potential compact crown types which can be either utilized directly for close spacing trials or could be added to present genetic resources for repeated cross breeding to generate more productive progenies with modified crown architecture.
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RRII Library Botany | Journals |
High yielding compact canopy clones of Hevea brasiliensis are beneficial to growers in resisting wind damage, favouring high density planting and deploying suitable intercrops to increase net income from the plantations. Genetic diversity for compact canopy trait in the available gene pool of Hevea is meagre except for a natural mutant (NM) selected from the seedling population. Utilization of NM was explored by using it as one of the parent in half-sib progeny selection approach. Four selected genotypes (compact, semi compact, intermediate and normal type) were evaluated in normal spacing (22 x 11 feet) along with the control (RRII 105). Trunk growth (cm), dry rubber yield (g/t/t) and canopy diameter/width (m) were assessed. Each types exhibited wide variability in terms of growth, dry rubber yield and crown compactness up to 17th year after planting. Girth canopy diameter and yield of four types (Compact: 58.5 cm, 1.2 m and 14.5 g/t/t; Semi Compact: 59.0 cm, 4.0 m and 8.1 g/t/t; Intermediate: 61.0 cm, 2.0 m and 34.8 g/t/t; Normal type: 78.7 cm, 5.5 m and 63.7 g/t/t, RRII 105: 63.3 cm, 4.6 m and 57.6 g/t/t) showed considerable variability. Intermediate crown type was found to be promising than its female parent in growth and yield, and modified crown type. This would be selected for further evaluation and confirmation in clonally replicated trials. Selection of clones with medium to high growth and compact canopy could maximize space utilization and better crop management practices such as high density planting and intercropping. The present study could identify potential compact crown types which can be either utilized directly for close spacing trials or could be added to present genetic resources for repeated cross breeding to generate more productive progenies with modified crown architecture.
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