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Exogenous foliar application of glycine betaine to alleviate water deficit tolerance in two indica rice genotypes under greenhouse conditions
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Document Title
Exogenous foliar application of glycine betaine to alleviate water deficit tolerance in two indica rice genotypes under greenhouse conditions
Author
Tisarum R., Theerawitaya C., Samphumphung T., Takabe T., Cha-Um S.
Name from Authors Collection
Scopus Author ID
55043179200
Affiliations
National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, 12120, Thailand; Research Institute, Meijo University, Nagoya, 468-8502, Japan
Type
Article
Source Title
Agronomy
ISSN
20734395
Year
2019
Volume
9
Issue
3
Open Access
All Open Access, Gold, Green
Publisher
MDPI AG
DOI
10.3390/agronomy9030138
Format
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 (P n ). Interestingly, P n 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. © 2019 by the authors.
Industrial Classification
Knowledge Taxonomy Level 1
Knowledge Taxonomy Level 2
Knowledge Taxonomy Level 3
Funding Sponsor
National Science and Technology Development Agency
License
CC BY
Rights
Author
Publication Source
Scopus