Version 1
: Received: 6 November 2021 / Approved: 8 November 2021 / Online: 8 November 2021 (13:27:53 CET)
How to cite:
Gowsiga, S.; Djanaguiraman, M.; Thavaprakaash, N.; Jeyakumar, P.; Mahalingam, G. Sorghum Drought Tolerance is Associated with Deeper Root System and Decreased Transpiration Rate. Preprints2021, 2021110144. https://doi.org/10.20944/preprints202111.0144.v1
Gowsiga, S.; Djanaguiraman, M.; Thavaprakaash, N.; Jeyakumar, P.; Mahalingam, G. Sorghum Drought Tolerance is Associated with Deeper Root System and Decreased Transpiration Rate. Preprints 2021, 2021110144. https://doi.org/10.20944/preprints202111.0144.v1
Gowsiga, S.; Djanaguiraman, M.; Thavaprakaash, N.; Jeyakumar, P.; Mahalingam, G. Sorghum Drought Tolerance is Associated with Deeper Root System and Decreased Transpiration Rate. Preprints2021, 2021110144. https://doi.org/10.20944/preprints202111.0144.v1
APA Style
Gowsiga, S., Djanaguiraman, M., Thavaprakaash, N., Jeyakumar, P., & Mahalingam, G. (2021). Sorghum Drought Tolerance is Associated with Deeper Root System and Decreased Transpiration Rate. Preprints. https://doi.org/10.20944/preprints202111.0144.v1
Chicago/Turabian Style
Gowsiga, S., Prabhakaran Jeyakumar and Govindaraj Mahalingam. 2021 "Sorghum Drought Tolerance is Associated with Deeper Root System and Decreased Transpiration Rate" Preprints. https://doi.org/10.20944/preprints202111.0144.v1
Abstract
Drought decreases grain yield of sorghum [Sorghum bicolor (L.) Moench], and understanding the mechanism(s) related to drought tolerance is critical for sustaining sorghum production. Variation in root and shoot traits associated with drought tolerance were analyzed to provide an integrated view of factors that underlie the drought tolerance of sorghum. The plants were grown in the root column up to the five-leaf stage, then exposed to either 0.9 fraction of transpirable soil water (FTSW) or 0.4 FTSW for five days. In another experiment, at the five-leaf stage, stress was imposed for 14 days. Various root and shoot traits associated with drought tolerance were recorded. The seminal root angle of IS13540 was lower (24.4) than IS23143 (42.6). Drought stress increased the maximum root length (40%) and total root length (58%) of IS13540 than its irrigated control. In contrast, the maximum root length and total root length were decreased in IS23143. Similarly, across the lines, drought stress decreased stomatal conductance (37%), transpiration rate (42%), photosynthetic rate (40%), photosystem II quantum yield (20%), photochemical quenching (44%), and total dry matter production (34%) than irrigated control. An increased transpiration rate was observed in IS23143 than IS13540 under irrigated and drought stress. In IS23143, the reduction in photosynthetic rate under drought may be a combination of stomatal and non-stomatal factors. However, in IS13540, the reduction is especially by the stomatal factors. It is evident that IS13540 is a drought-tolerant line, and tolerance is related to a deep prolific root system and reduced tran-spiration rate.
Biology and Life Sciences, Agricultural Science and Agronomy
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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