Narrow root cone angle promotes deeper rooting, cooler canopy temperatures and higher grain yield in a rice (Oryza sativa L.) recombinant inbred line population grown under different water availabilities in aerobic production systems

Vinarao, Ricky; Proud, Christopher; Snell, Peter; Fukai, S.; Mitchell, J. H.

doi:10.1016/j.fcr.2023.108989

Cited by 2 publications

(4 citation statements)

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“…We found that compared to cotton varieties with larger LRAs, those with smaller LRAs increased their stomatal opening by 15% and 43% under drought stress in 2021 and 2022, respectively. Our results are in agreement with Vinarao et al (2023) who showed that the narrow root cone angle rice genotypes have higher stomatal conductance compared to the wide root cone angle rice genotypes.…”

Section: Discussionsupporting

confidence: 93%

“…In particular, under drought stress, cotton varieties with smaller LRAs exhibited a 15%-43% increase in their stomatal opening compared to varieties with larger LRAs. These results are consistent with those of Kato and Okami (2010) and Vinarao et al (2023) , who demonstrated that, varieties with deeper or narrower root systems maintained larger stomatal openings and higher stomatal conductance under drought stress. Therefore, this response is crucial for water resource conservation since it is sufficient to maintain a higher water supply, alleviate drought stress, and improve the plant’s resistance to water deficits.…”

Section: Discussionsupporting

confidence: 92%

“…However, in the years 2021 and 2022, cotton varieties with smaller LRAs exhibited a significant reduction in the canopy temperature by 12% and 9%, respectively, when compared to varieties with larger LRAs under drought stress. This results is consistent with Vinarao et al (2023), who showed that compared to rice genotypes with wide root cone angle, the narrow root cone angle group had a 0.3-1.0°C decrease in canopy temperature below 20 centimeters.…”

Section: Canopy Temperature In Cotton Under Drought Stresssupporting

confidence: 91%

“…Recent studies provide support for such interrelationships. Vinarao et al (2023) published research that illustrated a similar relationship, albeit in a different crop context. In particular, the RCA had significant negative correlations with the total root length (r = -0.70), leaf area (r = -0.67), proportion of deep roots below 20 cm (r = -0.65), and stomatal conductance (r = -0.71).…”

Section: Discussionmentioning

confidence: 89%

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The crucial role of lateral root angle in enhancing drought resilience in cotton

Guo,

Bao,

Sun

et al. 2024

Front. Plant Sci.

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IntroductionPlant responses to drought stress are influenced by various factors, including the lateral root angle (LRA), stomatal regulation, canopy temperature, transpiration rate and yield. However, there is a lack of research that quantifies their interactions, especially among different cotton varieties.MethodsThis experiment included two water treatments: well-watered (75 ± 5% soil relative water content) and drought stress (50 ± 5% soil relative water content) starting from the three-leaf growth stage. ResultsThe results revealed that different LRA varieties show genetic variation under drought stress. Among them, varieties with smaller root angles show greater drought tolerance. Varieties with smaller LRAs had significantly increased stomatal opening by 15% to 43%, transpiration rate by 61.24% and 62.00%, aboveground biomass by 54% to 64%, and increased seed cotton yield by 76% to 79%, and decreased canopy temperature by 9% to 12% under drought stress compared to the larger LRAs. Varieties with smaller LRAs had less yield loss under drought stress, which may be due to enhanced access to deeper soil water, compensating for heightened stomatal opening and elevated transpiration rates. The increase in transpiration rate promotes heat dissipation from leaves, thereby reducing leaf temperature and protecting leaves from damage. DiscussionDemonstrating the advantages conferred by the development of a smaller LRA under drought stress conditions holds value in enhancing cotton’s resilience and promoting its sustainable adaptation to abiotic stressors.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 92%

Section: Canopy Temperature In Cotton Under Drought Stresssupporting

confidence: 91%

Section: Discussionmentioning

confidence: 89%

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