Genetic variation for root architectural traits in response to phosphorus deficiency in mungbean at the seedling stage

Abstract

Roots enable the plant to survive in natural environment by providing anchorage and acquisition of water and nutrients. In this study, 153 mungbean genotypes were studied to compare root architectural traits under normal and low phosphorus conditions. Significant variations, medium to high heritability, near normal distribution and significant correlations were observed for studied root traits. Total root length (TRL) was positively correlated with total surface area (TSA), total root volume (TRV), total root tips (TRT) and root forks. The first two principal components explained the 79.19 % and 78.84% of the total variation under normal and low phosphorus conditions. TRL, TSA and TRV were major contributors of variation and can be utilized for screening of phosphorus uptake efficiency at seedling stage. Released Indian mungbean varieties were found to be superior for root traits than other genotypic groups. Based on comprehensive phosphorus efficiency measurement, IPM-288, TM 96-25, TM 96-2, M 1477, PUSA 1342 were found to be best five highly efficient genotypes whereas M 1131, PS-16, Pusa Vishal, M 831, IC 325828 were highly inefficient genotypes. These identified highly efficient lines are valuable genetic resources for phosphorus uptake efficiency that could be used in mungbean breeding programme.

Genetic Variation for Traits Related to Phosphorus Use Efficiency in Lens Species at the Seedling Stage

“…This can be attributed to the diversity among and within the studied species for phosphorus uptake and utilization efficiency. These findings are in agreement with those reported in Brassica [27], common beans [28], maize [29] and green grams [18] under nutrient stress [18,[30][31][32]. Significant genotypic variation was reported for root and shoot traits in rice [33,34], wheat [30], and mung beans [18] and for P use traits in mung beans [18].…”

“…These findings are in agreement with those reported in Brassica [27], common beans [28], maize [29] and green grams [18] under nutrient stress [18,[30][31][32]. Significant genotypic variation was reported for root and shoot traits in rice [33,34], wheat [30], and mung beans [18] and for P use traits in mung beans [18]. Limited efforts have been made to study genetic diversity for phosphorus uptake and utilization efficiency in legumes.…”

“…We noted significant correlation between the TRL and TSV, TRV, TRT and RF in lentils. Similarly, the TRL was positively correlated with the TSA and TRV in maize [36], with the TRT and RF in mung beans [18], and the SDW, RDW, and TDW under both SP and LP conditions. In the present study, the TDW was positively correlated with the RDW and SDW and negatively correlated to the RSR under low P levels (Table 3).…”

“…Root traits such as root dry weight (RDW), total root length (TRL), total surface area (TSA), total root volume (TRV), total root tips (TRT) and fork number (FN) involved in P uptake are of higher significance in P-deficient soils [13][14][15]. The phenotyping of black gram genotypes for root traits suggested that RDW is a potential trait for improving P uptake [16], whereas TRL, TSA, TRV, TRT and FN and carboxylate exudation efficiency were important in green grams [17,18]. Shoot dry matter, total dry matter, and shoot P concentration were associated with high PUE in soybeans [19], whereas long root hairs and a high shoot to root ratio were positively correlated to PUE in Arabidopsis.…”

WITHDRAWN: Effectiveness of the Classification for the Phosphorus Use Efficiency Traits at the Seedling Stage in Lentil

“…The PUE of crops [23,24] will be enhanced by improvements in either PUPE or PUTE. In wheat [25], maize [26], brassica [27], rice [28], cowpea [29], mungbean [30][31], eld pea [32], soybean [33], sorghum [34], pearl millet [35], chickpea [36], and pigeonpea [37], there was a high genetic diversity in crops for PUE and its component traits.…”