Indian Society of Genetics & Plant Breeding

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Photosynthetic and yield traits identified through multivariate analysis in mungbean exhibiting tolerance to the combined stresses of low phosphorus and drought

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Experiments were conducted to study the genotypic
variability for tolerance to combined stresses of low
availability of phosphorus (P) and drought in 14 mungbean
[
Vigna radiata (L.) R. Wilczek] accessions. The accessions
were evaluated under four conditions
viz., control (sufficient
P, irrigated), low P (without P, irrigated), drought (sufficient
P, withholding irrigation) and combined stresses (low P,
withholding irrigation). The relative stress tolerance was
estimated for 22 agro-physiological traits. The principal
component analysis (PCA) and relative stress indices (RSIs)
of traits exhibited significant variation among the
treatments and accessions. Based on RSIs, the PCA ranking
analysis showed that the accessions IC 280489, PDM 139
and IC 76491 were highly ranked and tolerant to low P,
drought and combined stresses. The relative increase in
component traits such as photosynthetic parameters,
relative water content, above-ground biomass, seed P
content and number of pods plant
–1 were higher while
canopy temperature and water use efficiency were reduced
in tolerant accessions. In contrast, IPM 2-3 was found to be
relatively sensitive to all three treatments. Tolerant
accessions may be either included in the breeding program
or used directly as cultivar that can be grown under low P
and drought.
  

Keywords: Drought, low phosphorus, mungbean, water use efficiency, photosynthesis, harvest index

Info

Year: 2020
Volume: 80
Issue: 3
Article DOI: 10.31742/IJGPB.80.3.8
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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