Involvement of Secondary Metabolites in Response to Drought Stress of Rice ( Oryza sativa L.)

Nguyen Thanh Quan, La Hoang Anh, Do Tan Khang, Phung Thi Tuyen, Nguyen Phu Toan, Truong Ngoc Minh, Luong The Minh, Do Tuan Bach, Pham Thi Thu Ha, Abdelnaser Abdelghany Elzaawely, Tran Dang Khanh, Khuat Huu Trung and Tran Dang Xuan
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Nguyen Thanh Quan: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan
La Hoang Anh: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan
Do Tan Khang: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan
Phung Thi Tuyen: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan
Nguyen Phu Toan: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan
Truong Ngoc Minh: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan
Luong The Minh: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan
Do Tuan Bach: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan
Pham Thi Thu Ha: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan
Abdelnaser Abdelghany Elzaawely: Department of Botany, Faculty of Agriculture, Tanta University, Tanta 31527, Egypt
Tran Dang Khanh: Agricultural Genetics Institute, Hanoi 100000, Vietnam
Khuat Huu Trung: Agricultural Genetics Institute, Hanoi 100000, Vietnam
Tran Dang Xuan: Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8529, Japan

Agriculture, 2016, vol. 6, issue 2, 1-14

Abstract: In this study, responses of rice under drought stress correlating with changes in chemical compositions were examined. Among 20 studied rice cultivars, Q8 was the most tolerant, whereas Q2 was the most susceptible to drought. Total phenols, total flavonoids, and antioxidant activities, and their accumulation in water deficit conditions were proportional to drought resistance levels of rice. In detail, total phenols and total flavonoids in Q8 (65.3 mg gallic acid equivalent (GAE) and 37.8 mg rutin equivalent (RE) were significantly higher than Q2 (33.9 mg GAE/g and 27.4 mg RE/g, respectively) in both control and drought stress groups. Similarly, the antioxidant activities including DPPH radical scavenging, β -carotene bleaching, and lipid peroxidation inhibition in Q8 were also higher than in Q2, and markedly increased in drought stress. In general, contents of individual phenolic acids in Q8 were higher than Q2, and they were significantly increased in drought stress to much greater extents than in Q2. However, p -hydroxybenzoic acid was found uniquely in Q8 cultivars. In addition, only vanillic acid was found in water deficit stress in both drought resistant and susceptible rice, suggesting that this phenolic acid, together with p -hydroxybenzoic acid, may play a key role in drought-tolerance mechanisms of rice. The use of vanillic acid and p -hyroxybenzoic acid, and their derivatives, may be useful to protect rice production against water shortage stress.

Keywords: phenolic acids; drought stress; rice; antioxidant activity; vanillic acid; p -hydroxybenzoic acid; antioxidant activities; total phenols; total flavonoids (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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