Physiological and biochemical studies in mothbean [Vigna aconitifolia (Jacq.) Marechal] genotypes under soil moisture stress
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Date
2005
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CCSHAU
Abstract
The study entitled “Physiological and biochemical studies in mothbean [Vigna
aconitifolia (Jacq.) Marechal] genotypes under soil moisture stress” was conducted
during Kharif season of 2004 at crop physiology research area of Agronomy
Department CCS Haryana Agricultural University, Hisar. The experiment was laid out
in factorial RBD with four replications. The treatment consisted of two environments of
moisture stress (water stress and irrigated control) and four genotypes viz. RMO 40,
RMO 257, MB 99-1 and CZM 10. Water stress decreased the maturity duration and profile moisture content
consistently. Genotype RMO 40 was shortest in maturity duration and CZM 10 used
maximum water. Development of moisture stress enhanced the phonological
development significantly. Growth of mothbean in terms of plant height, dry matter
accumulation, LAI, LAD, CGR, SLA, and RGR decreased with increase in moisture
stress. However, root depth and SLW increased under moisture stress. All Plant water
status parameters i.e. w, s, RWC and CTD decreased from morning to afternoon
and with moisture stress. Gaseous exchange studies i.e. rate of photosynthesis,
transpiration and stomatal conductance get reduced under water stress. Genotype MB
99-1 maintained higher biomass, plant water status and gaseous exchange under
moisture stress. Biochemical metabolites i.e. chlorophyll, starch and protein content
declined under water stress. However, free proline, total soluble carbohydrates, and
free amino acids content showed sharp rise under moisture stress. Seed and biological
yield reduced significantly by decreasing yield attributing characters i.e. number of
effective pods, seeds per pod and test weight under water stress. Genotype MB 99-1
recorded highest seed yield and observed most drought tolerant in terms of having
higher plant water status; gaseous exchange and biochemical metabolites.