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Open AccessArticle

Water Deficit Effects on Soybean Root Morphology and Early-Season Vigor

1
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762, USA
2
Mississippi Water Resources Research Institute, Box 9547, Mississippi State University, Mississippi State, MS 39762, USA
3
Delta Research and Extension Center, Box 197, Stoneville, MS 38776, USA
*
Author to whom correspondence should be addressed.
Agronomy 2019, 9(12), 836; https://doi.org/10.3390/agronomy9120836
Received: 20 August 2019 / Revised: 29 October 2019 / Accepted: 30 November 2019 / Published: 3 December 2019
(This article belongs to the Section Water Use and Irrigation)
This study was conducted to determine if root, shoot, and gas exchange traits of determinate and indeterminate soybean cultivars respond differently to soil water deficit. The effect of soil water deficit imposed 4 and 10 days after sowing on growth and development parameters of determinate and indeterminate soybeans was evaluated for 18 and 30 days in experiment I and II, respectively. At both 18 and 30 days after seeding, nearly all root, shoot, and physiological parameters were inversely correlated with the soil moisture level, and the adverse effects of drought stress were more evident in Progeny P5333RY than in Asgrow AG5332. For both cultivars, the effect of soil water deficit on net photosynthesis was mainly due to stomatal limitations. The developed algorithms for the plant processes based on the environmental productivity index were not different between the cultivars, suggesting that soybean plants respond in a similar way irrespective of their growth habits, probably due to the shorter period of water stress. View Full-Text
Keywords: rought stress; root morphology; soybean indeterminate; evapotranspiration; photosynthesis; crop modeling rought stress; root morphology; soybean indeterminate; evapotranspiration; photosynthesis; crop modeling
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MDPI and ACS Style

Wijewardana, C.; Alsajri, F.; Irby, J.; Krutz, L.; Golden, B.; Henry, W.; Reddy, K. Water Deficit Effects on Soybean Root Morphology and Early-Season Vigor. Agronomy 2019, 9, 836.

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