Leaf potassium status for drought tolerance: The hunt for promising sesame (<i>Sesamum indicum</i>L.) accessions

Pandey, Brij Bihari; Ratnakumar, P.; Kulasekaran, Ramesh; Qureshi, A.A.; Gandi, Sowjanya Lakshmi; Guhey, Arti

doi:10.1080/01904167.2022.2043374

Cited by 7 publications

(2 citation statements)

References 36 publications

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“…It has been well evidenced that sufficient K nutrition is essential for maintaining the balance of leaf water relations in plants during water stress (Premachandra et al, 1991; Kanai et al, 2011; de Souza et al, 2021; Pandey et al, 2022). In the present study, we found that K deficiency exacerbated the reduction in relative leaf water content and Ψ leaf under water deficit, and it was more pronounced as the time without watering increased, especially for WDR (Figure 4a and b).…”

Section: Discussionmentioning

confidence: 99%

Potassium deficiency enhances imbalances in rice water relations under water deficit by decreasing leaf hydraulic conductance

Yang,

Lu,

Xiong

et al. 2024

Physiologia Plantarum

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Potassium (K+) is an essential macronutrient for appropriate plant development and physiology. However, little is known about the mechanisms involved in the regulation of leaf water relations by K under water deficit. A pot experiment with two K supplies of 0.45 and 0 g K2O per pot (3 kg soil per pot) and two watering conditions (well‐watered and water‐deficit) was conducted to explore the effects of K deficiency on canopy transpiration characteristics, leaf water status, photosynthesis, and hydraulic traits in two rice genotypes with contrasting resistance to drought. The results showed that K deficiency reduced canopy transpiration rate by decreasing stomatal conductance, which led to higher canopy temperatures, resulting in limited water deficit tolerance in rice. In addition, K deficiency led to further substantial reductions in leaf relative water content and water potential under water deficit, which increased the imbalance in leaf water relations under water deficit. Notably, K deficiency limited leaf gas exchange by reducing leaf hydraulic conductance, but decreased the intrinsic water use efficiency under water deficit, especially for the drought‐resistant cultivar. Further analysis of the underlying process of leaf hydraulic resistance revealed that the key limiting factor of leaf hydraulic conductance under K deficiency was the outside‐xylem hydraulic conductance rather than the xylem hydraulic conductance. Overall, our results provide a comprehensive perspective for assessing leaf water relations under K deficiency, water deficit, and their combined stresses, which will be useful for optimal rice fertilization strategies.

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Section: Discussionmentioning

confidence: 99%

Potassium deficiency enhances imbalances in rice water relations under water deficit by decreasing leaf hydraulic conductance

Yang,

Lu,

Xiong

et al. 2024

Physiologia Plantarum

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“…Hence, it is widely used for human nutrition, medicinal, and industrial purposes in many countries ( Bastug et al, 2021 ). Sesame is frequently cultivated in arid and semi-arid areas inhabiting “hungry and thirsty” environments ( Ramesh et al, 2019 ), where it is frequently exposed to deficit moisture stress ( Ratnakumar & Ramesh, 2019 ; Pandey et al., 2021a ). In rainfed ecosystems, time and duration of water stress have a significant effect on sesame productivity ( Ravitej et al, 2019 ), although the genotypes might have varied responses in maintaining the leaf chlorophyll content and are directly related to tolerance and higher productivity under WS ( Kadkhodaie et al, 2014 ; Pandey et al., 2021b ).…”

Section: Introductionmentioning

confidence: 99%

Analysing the SPAD dynamics of water-stressed vs. well-watered sesame (Sesamum indicumL.) accessions and establishing their relationship with seed yield

Pallavolu

Pasala

Kulasekaran

et al. 2023

PeerJ

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Background The chlorophyll content is susceptible to deficit moisture stress and may affect the plant yield. Leaf chlorophyll content is directly related to tolerance and higher productivity under deficit moisture stress (WS). The SPAD meter is an excellent tool for rapid analysis of crop chlorophyll content. Therefore, establishing a relationship between leaf chlorophyll content and seed yield is crucial in sesame, particularly under deficit moisture stress. Methods Seeds of 37 sesame genotypes with checks were used in this study. These genotypes were mostly landraces, adapted to different agro-ecological zones in India. The selected genotypes were evaluated under well water (WW) and deficit moisture stress (WS) conditions. The SPAD readings were recorded ten (10) times each at every seven days intervals from the juvenile/first bud (30–35 days after sowing) to ripening/ physiological maturity (95–100 days after sowing) stage. This study aimed to identify the association between leaf SPAD readings (recorded at 7-days interval) and seed yield of sesame genotypes. Results The analysis of variance revealed the presence of significant variation in SPAD readings due to treatment (WW and WS), genotypes, and their interaction effects. The SPAD readings at all stages were positively correlated with seed yield in both WW and WS. High values of correlation coefficients were observed at 52 (r: 0.672) and 59 (r: 0.655) DAS under WS; whereas at 59 (r: 0.960), 66 (r: 0.972) and 73 (r: 0.974) DAS under WW at one percent significance level (p < 0.01), which coincided with the mid-bloom stage of the sesame crop. The best-fit multiple regression model revealed that the dependence of sesame seed yield is significantly influenced by SPAD reading at 52 DAS under WS and 59 to 73 DAS under WW. Both these models provide a good fit with the chi-squared test, which compares the predicted and observed yield.

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Insights into the Drought Stress Tolerance Mechanisms of Sesame: The Queen of Oilseeds

Jeyaraj,

Beevy

2024

J Plant Growth Regul

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Leaf potassium status for drought tolerance: The hunt for promising sesame (Sesamum indicumL.) accessions

Cited by 7 publications

References 36 publications

Potassium deficiency enhances imbalances in rice water relations under water deficit by decreasing leaf hydraulic conductance

Potassium deficiency enhances imbalances in rice water relations under water deficit by decreasing leaf hydraulic conductance

Analysing the SPAD dynamics of water-stressed vs. well-watered sesame (Sesamum indicumL.) accessions and establishing their relationship with seed yield

Insights into the Drought Stress Tolerance Mechanisms of Sesame: The Queen of Oilseeds

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