สืบค้นงานวิจัย
Evaluation of Half-Sib Progenies of Canopy Mutant of Hevea brasiliensis
T. Gireesh - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Evaluation of Half-Sib Progenies of Canopy Mutant of Hevea brasiliensis
ผู้แต่ง / หัวหน้าโครงการ (EN): T. Gireesh
บทคัดย่อ (EN): Hevea brasiliensis (Willd. ex A. Juss.) Muell. Arg., belonging to the family Euphorbiaceae, is cultivated mainly in South East Asian countries. Inheritance of most of the agronomic characters in Hevea is quantitative in nature and transfer of complex traits needs larger breeding populations and generations. Canopy and tree architecture are important features often determining both the tree-level and stand-level productivity and its susceptibility towards wind. Compact canopy genotypes not only avoids wind damage but also helps the planters in getting enough room for optimal utilization of land. However, genetic base of crown architecture is less intensively studied and is rarely utilized in tree improvement programmes. A natural mutant of H. brasiliensis showing distinct morphological variation in the crown has been reported. The objective of the present study is to understand the growth and crown structural variability in the selected half-sib progenies of a natural mutant in a traditional rubber growing area. The study was performed at the Central Experiment Station of Rubber Research Institute of India. The plant materials comprised of clones of four genotypes selected from half-sib progenies of canopy mutant. These four clones along with control (RRII 105) were brown budded onto rootstocks. The successful stumps were recovered and planted in polythene bags (55 cm x 25 cm when laid flat) filled with top soil and raised in a nursery. Six monthold plants were planted in the field site in replicated blocks adopting randomized block design with plot size of five plants in six replications, and uniform spacing of 4.9 m x 4.9 m. Recommended crop management practices were performed throughout the experiment. Growth parameters were observed from the field grown plants in the 4th year onwards. Tree height (m) and diameter of the canopy (m) also measured at the age of four years. On maturity, S/2 d3 6d/7 system of tapping was followed. Dry rubber yield was measured from each experimental tree in gram per tree per tapping (g/t/t) by coagulating the latex in collection cups. Mean dry rubber yield was recorded by taking one sample per month (12 samples per year). Analysis of variance revealed significant variability among clones of different morphotypes in terms of growth and dry rubber yield (CV 33.4%) in the field over 17 years. Crown morphology was described as per Ford (1985) as either decurrent globose or excurrent types or its intermediate types. Girth and yield of the four morphotypes (Semi Compact: 46 cm, 17.2 g/t/t; Intermediate: 81.0 cm, 28.3 g/t/t; Normal type: 76 cm, 25 g/t/ t and RRII 105: 64.2 cm, 45 g/t/t) showed significant variability. The mean canopy spread/ width of the normal type and RRII 105 was more than 5 m whereas the intermediate type has a canopy spread of 3 to 3.5 m only. The intermediate crown type can be considered promising than the check clone in terms of extent of crown width though rubber yield is less. Increase in plant density could compensate for lower yield and could also reduce the damage/ tree loss in wind prone areas. This clone could be subjected to further density cum clone trials to arrive at an optimum tree stand for profitable yield. Identification of varieties with medium to high growth and compact canopy could maximize space utilization; reduce wind damage and adoption of optimum crop management practices like intercropping. The present study could also identify potential compact crown types which can be either utilized directly for close spacing trials or could enrich present genetic resources for further breeding.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): rubber yield
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

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T. Gireesh. "Evaluation of Half-Sib Progenies of Canopy Mutant of Hevea brasiliensis". ไม่ระบุหน่วยงาน. ม.ป.ป.

T. Gireesh. "Evaluation of Half-Sib Progenies of Canopy Mutant of Hevea brasiliensis". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Evaluation of Half-Sib Progenies of Canopy Mutant of Hevea brasiliensis
T. Gireesh
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
Evaluation of ground basalt as soil amelioration in relation to growth and nutrition of Hevea brasiliensis grown in polybags Influence of age and girth at opening on rubber yield, biochemical and tapping panel dryness parameters of Hevea brasiliensis in determining tapping norms Inheritance of Tapping Panel Dryness (TPD) in a Full-Sib Population of Hevea brasiliensis Evaluation of some clones (Hevea brasiliensis) in a small scale trial in the southern part of Guatemala ATP Concentration in Latex as a Biochemical Marker for Early Evaluation of Yield in Hevea brasiliensis Evaluation of Rubber (Hevea brasiliensis) Modern Clones under Certain Stressful Climatic Conditions of Odisha Cloning and expression of HbACO2 of Hevea brasiliensis Half Ovulo Embryo Culture-An Ideal Method for Raising True-To-Type Seedlings in Hevea brasiliensis Components of Inorganic Phosphates in Rhizosphere of Rubber Tree (Hevea brasiliensis) Plant Hormones and Oxidative Stress in Hevea brasiliensis
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