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Agronomy 2019, 9(3), 138; https://doi.org/10.3390/agronomy9030138

Exogenous Foliar Application of Glycine Betaine to Alleviate Water Deficit Tolerance in Two Indica Rice Genotypes under Greenhouse Conditions

1
National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani 12120, Thailand
2
Research Institute, Meijo University, Nagoya 468-8502, Japan
*
Author to whom correspondence should be addressed.
Received: 3 February 2019 / Revised: 25 February 2019 / Accepted: 15 March 2019 / Published: 18 March 2019
(This article belongs to the Special Issue Roles of Glycine Betaine in Improving Plant Abiotic Stress Resistance)
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Abstract

The aim of this investigation was to enhance overall growth, yield attributes as well as physio-biochemical adaptive strategies by exogenous foliar application of glycine betaine (GlyBet) in two rice varieties against water deficit stress under greenhouse conditions. Rice crop cvs. RD43 (low amylose content) and SPR1 (high amylose content) grown in clay pots containing garden soil until booting stage were chosen as the test plant material, sprayed by 0 (control) or 100 mM GlyBet and subsequently subjected to: MWD (mild water deficit by 8 d water withholding; 24.80% SWC; Soil water content) or SWD (severe water deficit by 14 d water withholding; 13.63% SWC) or WW (well-watered conditions or control). Free proline content in cv. RD43 was rapidly increased in relation to the degree of water deficit and suppressed by exogenous GlyBet, while free proline in cv. SPR1 was lower than cv. RD43. Overall growth performances and yield traits in both cultivars under MWD were maintained by exogenous application of GlyBet; however, these parameters declined under SWD even after the GlyBet application. Degradation of photosynthetic pigments and chlorophyll fluorescence in pretreated GlyBet plants under SWD were prevented, resulting in elevated net photosynthetic rate (Pn). Interestingly, Pn was very sensitive parameter that sharply declined under SWD in both RD43 and SPR1 genotypes. Positive relationships between physio-morphological and biochemical changes in rice genotypes were demonstrated with high correlation co-efficiency. Based on the key results, it is concluded that foliar GlyBet application may play an important role in drought-tolerant enhancement in rice crops. View Full-Text
Keywords: free proline; growth characters; net photosynthetic rate; photosynthetic pigments; yield attributes free proline; growth characters; net photosynthetic rate; photosynthetic pigments; yield attributes
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Tisarum, R.; Theerawitaya, C.; Samphumphung, T.; Takabe, T.; Cha-um, S. Exogenous Foliar Application of Glycine Betaine to Alleviate Water Deficit Tolerance in Two Indica Rice Genotypes under Greenhouse Conditions. Agronomy 2019, 9, 138.

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