สืบค้นงานวิจัย
Early Evaluation of a Set of Wild Hevea Germplasm for Drought Tolerance in the North Konkan Region
M. A. Mercy - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Early Evaluation of a Set of Wild Hevea Germplasm for Drought Tolerance in the North Konkan Region
ผู้แต่ง / หัวหน้าโครงการ (EN): M. A. Mercy
บทคัดย่อ (EN): The expedition conducted by International Rubber Research and Development Board in 1981 in the Amazon forests of Brazil, resulted in a collection of 4548 wild germplasm accessions of Hevea brasiliensis in India. This expedition mainly concentrated in three states of Brazil, namely Acre (AC), Rondonia (RO) and Mato Grosso (MT) with different agro climatic conditions. This wild germplasm collection is conserved at Rubber Research Institute of India (RRII) and is now in various stages of evaluation. Wide variability observed in this large collection indicates that this collection has a broad genetic base, potentially important in broadening the existing narrow genetic base of cultivated rubber. Being a likely repository of genes conferring tolerance to various biotic and abiotic stresses, this wild collection is useful in developing Hevea clones tolerant to stresses. Early evaluation of this germplasm accessions at a drought prone area, gives an indication towards their drought tolerance potential. One such field screening with a set of 130 wild accessions was conducted at the drought prone area of Dapchari in Maharshtra, W. India. This region experiences high temperature (exceeding 40o C in April), high light intensity and very low soil moisture during the summer months. It has a rainfall pattern limited only to four months in a year, with an average annual rain fall of 7.5mm per day and an average of 90 rainy days in a year. A potential high yielding clone RRII 105, a proven drought tolerant clone RRIM 600 and a drought susceptible clone, Tjir 1 were the check clones used. The accessions for field screening were randomly selected from the conservation nurseries maintained at Central Experiment Station at Chethackal in Kerala. They were evaluated for six consecutive years from 2003 to 2009 for assessing their growth and clonal response towards drought stress experienced from February to May, at RRS, Dapchari. The statistical design adopted was augmented RBD with five plants per plot at a spacing of 2.5 X 2.5 meters. There were nine blocks and the three check clones were repeated in each block. Standard cultural practices were followed. Data recording on growth and drought related parameters during summer and non summer periods was repeated for assessing the response of these accessions towards drought stress. Plant height, girth, number of whorls and number of leaves were the growth parameters studied and leaf senescence (%) was the drought related parameter measured. Annual girth increment was recorded continuously for three years from third to fifth year as an indicator towards attaining early tappabality and summer girth increment was recorded continuously for five years from first to fifth year as an indicator towards summer stress tolerance. Xylem characteristics and intra xylary phloem in one year old twig samples were used as drought related anatomical parameter. Recent studies have suggested the use of this trait for selection towards potential drought tolerant clones due to the possible activation of this tissue under conditions of stress. The accessions were subjected to test tapping at fourth year to know their yielding potential under drought prone condition. Finally the mortality rate among the accessions was assessed at the end of six years after exposure to six summer seasons, which give an indication towards genetic diversity among these wild accessions towards drought stress tolerance. Wide variability was noticed among the accessions for all the characters studied. In general, MT and RO accessions showed superiority for almost all the growth characters. After experiencing first summer at Dapchari, accessions MT 1697 and RO 2387 showed good vigour and accessions MT 47 and MT 4222 showed less leaf senescence. In MT 1623 there was good foliage even after exposing to summer stress. In 12 accessions, annual girth increment was higher than all the three check clones. During the summer period, 13 accessions showed good growth in terms of girth compared to the proven drought tolerant clone RRIM 600. Quantification of intra xylary phloem showed clonal variability. Out of 130 accessions evaluated, two potential accessions RO 1769 and RO 2976 gave test tap yield higher than the check clones RRII 105 and RRIM 600 under drought stress. Based on the overall growth performance under drought stress condition for a period of six years, test tap yield and mortality rate, seven accessions (MT 2229, MT 915, AC 173, RO 1769, RO 2976, MT 1660, MT 62) out of 130 could be selected for identifying candidate genes based on the drought tolerance attribute they possess after detailed evaluation at the drought prone area.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): drought tolerance
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

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M. A. Mercy. "Early Evaluation of a Set of Wild Hevea Germplasm for Drought Tolerance in the North Konkan Region". ไม่ระบุหน่วยงาน. ม.ป.ป.

M. A. Mercy. "Early Evaluation of a Set of Wild Hevea Germplasm for Drought Tolerance in the North Konkan Region". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Early Evaluation of a Set of Wild Hevea Germplasm for Drought Tolerance in the North Konkan Region
M. A. Mercy
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
Early Performance of some Clones of Hevea brasiliensis In Dry Sub humid Region of North Konkan Drought Tolerance in Transgenic MsSOD Hevea brasiliensis in A Dry Humid Environment ATP Concentration in Latex as a Biochemical Marker for Early Evaluation of Yield in Hevea brasiliensis Amazonian Accessions of Wild Hevea Germplasm - A Potential Source of Drought Tolerance IDENTIFICATION OF DROUGHT TOLERANT GENES BY QUANTITATIVE EXPRESSION ANALYSIS IN HEVEA BRASILIENSIS Chloroplast DNA Microsatellite Differentiation in Cultivated and Wild Rubber Tree (Hevea brasiliensis) Evaluation of some clones (Hevea brasiliensis) in a small scale trial in the southern part of Guatemala Effects of drought and tapping for latex production on water relations of Hevea brasiliensis trees IMPROVEMENT AND APPLICATION OF THE TECHNIQUE OF MINI-SEEDLING BUDDING OF HEVEA BRASILIENSIS Evaluation of Rubber (Hevea brasiliensis) Modern Clones under Certain Stressful Climatic Conditions of Odisha
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