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Information Journal Paper

Title

Evaluation and selection of drought-tolerant rice genotypes by fluorometric methods

Pages

  1-21

Abstract

 Background and Objectives: Water deficit in soil and atmosphere is the most important limiting factor for photosynthesis and plants growth especially Rice and adversely affect on photosynthesis through reduction the carbon assimilation due to stomatal and metabolic constraints. Since the capacity for photo-protection is limited, drought can lead to loss of active PSII reaction centers. Therefore, non-destructive measurements of photosynthesis by chlorophyll a fluorometry may potentially provide information about plant viability and performance in response to drought. Rice was sensitive to drought increase when drought happens during the vegetative and flowering period. Plants response to drought stress can be assess by identification of character involve an important role in drought tolerance in morphological, cellular, biochemical and molecular levels. This experiment was conducted to evaluate the Rice genotypes by measuring the traits associated with photosynthetic pigments and Chlorophyll fluorescence components in order to select appropriate criteria for Screening and drought stress tolerant in Rice genotypes. Materials and Methods: This experiment was arranged in randomized complete blocks design in Iran Rice Research Institute (Amol) in 2014. It was carried out in two conditions of well watered and drought stress during seedling stage in 56 Rice genotypes from different provinces of Iran and the International Rice Research Institute (IRRI). After seeding, the seedlings daily irrigated until two to three leaf seedling stages. After 15 days, in normal irrigated conditions, irrigation continued-to the end of the growth period while completely cut off for drought stress treatments. When soil moisture reached to 20% (about 10 days after irrigation stop), the photosynthetic pigments related traits such as chlorophyll a, b and carotenoids and Chlorophyll fluorescence attributes such as Fv/Fm, Φ PSII, qN, ETR and PAR were measured using the scientific methods. Result and Discussion: The results showed that the amount of chlorophyll a and b, increased, 2. 3 and 21. 4 percent respectively and carotenoids content, decreased by 3. 8 percent in drought stress. Chlorophyll fluorescence parameters were significantly different in the two environments except for Fv/Fm. Φ PSII, qN, ETR and PAR parameters which reduced in stress conditions by 7. 3, 13, 35. 5 and 28. 8%, respectively. Correlation results showed that chlorophyll a with b and carotenoids had a significant and positive correlation with chlorophyll a and b. Also correlation between Φ PSII with Fv/Fm (r=0. 29; P<0. 05) and qN (r=-0. 91; P<001) was negative and significant. Conclusions: The results showed that chlorophyll pigments and Chlorophyll fluorescence parameters, especially Φ PSII and ETR can be using as an evaluation criteria for the selection and Screening of tolerant Rice genotypes under drought stress conditions.

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    APA: Copy

    NASIRI, M., MESKARBASHI, M., HASSIBI, P., & PIRDASHTI, H.. (2020). Evaluation and selection of drought-tolerant rice genotypes by fluorometric methods. JOURNAL OF PLANT PRODUCTION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 27(3 ), 1-21. SID. https://sid.ir/paper/956431/en

    Vancouver: Copy

    NASIRI M., MESKARBASHI M., HASSIBI P., PIRDASHTI H.. Evaluation and selection of drought-tolerant rice genotypes by fluorometric methods. JOURNAL OF PLANT PRODUCTION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2020;27(3 ):1-21. Available from: https://sid.ir/paper/956431/en

    IEEE: Copy

    M. NASIRI, M. MESKARBASHI, P. HASSIBI, and H. PIRDASHTI, “Evaluation and selection of drought-tolerant rice genotypes by fluorometric methods,” JOURNAL OF PLANT PRODUCTION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 27, no. 3 , pp. 1–21, 2020, [Online]. Available: https://sid.ir/paper/956431/en

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