Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Sorghum Drought Tolerance is Associated with Deeper Root System and Decreased Transpiration Rate

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. Preprints 2021, 2021110144 (doi: 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 (doi: 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.

Keywords

Deep root system; Photosynthetic rate; Root angle; Root length; Sorghum; Transpiration rate

Subject

BIOLOGY, Agricultural Sciences & Agronomy

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.