PHENOTYPIC RESPONSES OF THAI JASMINE RICE (Oryza sativa L. KDML105) AND ITS MUTANTS TO SODIUM CHLORIDE STRESS

Artadana, Ida Bagus Made and Supaibulwatana, Kanyaratt (2014) PHENOTYPIC RESPONSES OF THAI JASMINE RICE (Oryza sativa L. KDML105) AND ITS MUTANTS TO SODIUM CHLORIDE STRESS. In: 2nd Asean Plus Three Graduate Research Congress. Faculty of Graduate Studies Mahidol Universty and Council of the Graduate studies Administrators of public and Autonomous University, Bangkok. ISBN 978-616-279-424-7

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Abstract

Salt stress is a major abiotic stress affected morphology and physiology of crop plant, leading to reduction in crop productivity. The objective of this study is to evaluate the morphology and physiology of KDML 105 rice and its mutants under sodium chloride stress by focusing at booting stage of plant development. Plant materials were prepared by Micropropagation prior to acclimated and transplanting into pots and cultivated until the booting stage of development was observed. They were then treated with salt stress by drenching the pots with with 0 or 150 mM NaCl solution for 15 days. At 10 days after treatment it was found that salt stress reduced net photosynthetic rate (NPR) of all plant line KDML105, MT4, MT5 and MT6 by 46.8±9.6%, 45.2±10.6%, 30.9±16.4% and 46.5±13.0%, respectively. Compare to its mutants, KDML 105 had more percentages of pigment reduction in leaves after treated with 150 NaCl. The reduction of chlorophyll a and chlorophyll b in KDML 105 was 64.4±3.8% and 72.7±7.5%, respectively when compared to control without NaCl (0 mM). The total numbers of spikelet per plant were not affected by sodium chloride stress at booting stage. However, salt stress at booting stage for 15 days could significantly reduce the total grain weight per plant, which was observed in KDML 105 (72.2%), MT4 (66.7%), MT5 (45%) and MT6 (40%) when compared with condition without salt. This result indicated that the mutants had differently performed their phenotypic responses to salt stress when compared with their original KDML105. These different responses also demonstrated in terms of seed fertility and their productivity when salt stress was applied at booting stage. According to this present study, it was suggested that mutant lines MT5 and MT6 show their interesting phenotypes in response to salt stress and may be represented as the useful candidates for breeding program of Thai rice

Item Type: Book Section
Uncontrolled Keywords: KDML 105, mutant, salt stress, chlorophyll, grain weight
Subjects: Q Science > QH Natural history > QH301 Biology
Depositing User: Eko Setiawan 194014
Date Deposited: 14 Dec 2015 05:22
Last Modified: 14 Dec 2015 05:22
URI: http://repository.ubaya.ac.id/id/eprint/26366

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