Evaluation of Blackgram Germplasm for Resistance against YMV

Blackgram (minumulu) is a very important grain legume crop grown in Andhra Pradesh in all the seasons but predominantly during rabi under rice fallows. The GunturDistrict ranks first in Andhra Pradesh for the production of blackgram. Blackgram is very nutritious as it contains high levels of proteins, potassium, calcium, iron, niacin (B3), thimine (B1), Riboflavin (B2). Blackgram has been shown to be useful in mitigating elevated cholesterol levels. Blackgram has received prominence in Indian dites especially for culinary preparation of dal, Idli, Vada, Dosa, papad.

Although blackgram has been traditionally cultivated after rice in krishna delta, it was consider only as subsistent crop with yields usually below 0.5 t/ha. Following comprehensive constraint analysis in 1980’s cultivar improvement programme was initiated Satyanarayana 1994 and the resistant disease resistant varieties LBG-17 (powderynildw disease), LBG -402 (wilt), LBG - 645 banda polish (wilt) etc... With yields exceeding 2.5 t / ha under with minimal management conditions. The above cultivars catalyzed commercialization of crop on largescale and economy of the farmers as well as sustainability of the productionsystem. Blackgram production in rice fellows contributed to area and production increase in the state from 410 kg / ha on 219 00 ha in 1981- 82 to 737 kg/ha on 560,000 ha in 1991-92.

Substrate Effects on Plant Transpiration Rate under Several Vapour Pressure Deficit (VPD) Levels

Panicum maximum (guinea grass) preferably grows in tropical and subtropical areas of the world on a wide variety of soil. Motta also reported that Guinea grassesare well adapted to a wide range of soils. It is tolerant to light frost and low soil pH.Cook et al.also mentioned that guinea grasses are drought tolerant and they can survive a shortage of water.

VPD is a good indicator of plant stress, brought about by either excessive transpiration of water (high VPD values) or the inability to transpire adequately (low VPD values). Vapor pressure deficit is the difference between the vapor pressure atambient conditions and the vapor pressure at saturation point for the sametemperature. Because saturation vapor pressure increases exponentially with temperature, VPD increases with temperature exponentially if absolute humidity is held constant. Therefore, temperature and vapor pressure deficit (VPD) effects on plant growth are usually confounded. Increasing VPD rates raise up the atmospheric demand and consequently higher plant transpiration. Stomatal closure limits the transpiration rate and sometimes a decrease at high VPD. Therefore, stomatal closure restricts the corresponding decrease in plant water potential and prevents excessive water loss.

Evaluation of Blackgram Germplasm for Resistance against YMV

Blackgram (minumulu) is a very important grain legume crop grown in Andhra Pradesh in all the seasons but predominantly during rabi under rice fallows. The GunturDistrict ranks first in Andhra Pradesh for the production of blackgram. Blackgram is very nutritious as it contains high levels of proteins, potassium, calcium, iron, niacin (B3), thimine (B1), Riboflavin (B2). Blackgram has been shown to be useful in mitigating elevated cholesterol levels. Blackgram has received prominence in Indian dites especially for culinary preparation of dal, Idli, Vada, Dosa, papad.

Although blackgram has been traditionally cultivated after rice in krishna delta, it was consider only as subsistent crop with yields usually below 0.5 t/ha. Following comprehensive constraint analysis in 1980’s cultivar improvement programme was initiated Satyanarayana 1994 and the resistant disease resistant varieties LBG-17 (powderynildw disease), LBG -402 (wilt), LBG - 645 banda polish (wilt) etc... With yields exceeding 2.5 t / ha under with minimal managementconditions. The above cultivars catalyzed commercialization of crop on large scale and economy of the farmers as well as sustainability of the production system. Blackgram production in rice fellows contributed to area and production increase in the state from 410 kg / ha on 219 00 ha in 1981- 82 to 737 kg/ha on 560,000 ha in 1991-92.

Evaluation of Blackgram Germplasm for Resistance against YMV

Blackgram (minumulu) is a very important grain legume crop grown in Andhra Pradesh in all the seasons but predominantly during rabi under rice fallows. The GunturDistrict ranks first in Andhra Pradesh for the production of blackgram. Blackgram is very nutritious as it contains high levels of proteins, potassium, calcium, iron, niacin (B3), thimine (B1), Riboflavin (B2). Blackgram has been shown to be useful in mitigating elevated cholesterol levels. Blackgram has received prominence in Indian dites especially for culinary preparation of dal, Idli, Vada, Dosa, papad.

Although blackgram has been traditionally cultivated after rice in krishna delta, it was consider only as subsistent crop with yields usually below 0.5 t/ha. Following comprehensive constraint analysis in 1980’s cultivar improvement programme was initiated Satyanarayana 1994 and the resistant disease resistant varieties LBG-17 (powderynildw disease), LBG -402 (wilt), LBG - 645 banda polish (wilt) etc... With yields exceeding 2.5 t / ha under with minimal managementconditions. The above cultivars catalyzed commercialization of crop on large scale and economy of the farmers as well as sustainability of the production system. Blackgram production in rice fellows contributed to area and production increase in the state from 410 kg / ha on 219 00 ha in 1981- 82 to 737 kg/ha on 560,000 ha in 1991-92.