Publications of NIPGR Scientists

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Author: search.filters.author.Donde, RavindraHas files: Yes

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    Physiological and genetic basis of superior phosphate uptake and utilization efficiency in the rice landrace Wazuhophek
    (Oxford University Press, 2025) Kohli, Pawandeep Singh; Donde, Ravindra; Sirohi, Ujjwal; Singh, Bhagat; Anantha, M S; Bhadana, Vijai Pal; Sundaram, Raman Meenakshi; Mangrauthia, Satendra K; Giri, Jitender
    Low phosphorus (P) availability due to edaphic conditions or the scarcity of P fertilizers restricts agricultural productivity. Various rice-growing regions experience poor P availability. Landraces from these regions, such as Wazuhophek in Northeast India, may provide a source of critical genetic variation needed for developing highly efficient, tolerant rice varieties. This study identifies the physiological and genetic basis of higher efficiency and tolerance in Wazuhophek. Wazuhophek displays higher shoot P content across three different P regimes (0, 15, and 200 µM P) compared to the sensitive parent, Improved Samba Mahsuri (ISM). In 0 µM, Wazuhophek’s increased shoot P content can be attributed to greater root physiological P use efficiency and improved root-to-shoot P translocation. At 15 and 200 µM P, Wazuhophek exhibited a higher crown root number and surface area, with more efficient roots than ISM, facilitating better Pi acquisition and higher shoot P. Furthermore, the genetic basis was delineated by identifying quantitative trait loci (QTLs) for critical traits. Revealing Wazuhophek’s physiological mechanism of low P tolerance provides valuable insights for developing rice varieties suited for nutrient-poor soil. Additionally, the identified QTLs for key traits offer targets for breeding more efficient low P-tolerant rice.
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    Dissecting chickpea genomic loci associated with the root penetration responsive traits in compacted soil
    (Springer Nature Publishing AG, 2024) Donde, Ravindra; Kohli, Pawandeep Singh; Pandey, Mandavi; Sirohi, Ujjwal; Singh, Bhagat; Giri, Jitender
    Soil compaction is a major concern for modern agriculture, as it constrains plant root growth, leading to reduced resource acquisition. Phenotypic variation for root system architecture (RSA) traits in compacted soils is present for various crops; however, studies on genetic associations with these traits are lacking. Therefore, we investigated RSA traits in diferent soil compaction levels and identifed signifcant genomic associations in chickpea. We conducted a Genome-Wide Association Study (GWAS) of 210 chickpea accessions for 13 RSA traits under three bulk densities (BD) (1.1BD, 1.6BD, and 1.8BD). Soil compaction decreases root exploration by reducing 12 RSA traits, except average diameter (AD). Further, AD is negatively correlated with lateral root traits, and this correlation increases in 1.8BD, suggesting the negative efect of AD on lateral root traits. Interestingly, we identifed probable candidate genes such as GLP3 and LRX for lateral root traits and CRF1-like for total length (TL) in 1.6BD soil. In heavy soil compaction, DGK2 is associated with lateral root traits. Reduction in laterals during soil compaction is mainly due to delayed seedling establishment, thus making lateral root number a critical trait. Interestingly, we also found a higher contribution of the GxE component of the number of root tips (Tips) to the total variation than the other lateral traits. We also identifed a pectin esterase, PPE8B, associated with Tips in high soil compaction and a signifcantly associated SNP with the relative change in Tips depicting a trade-of between Tips and AD. Identifed genes and loci would help develop soil-compaction-resistant chickpea varieties.