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Research articles

ScienceAsia 43(2017): 70-81 |doi: 10.2306/scienceasia1513-1874.2017.43.070

Influence of paclobutrazol on growth performance, photosynthetic pigments, and antioxidant efficiency of Pathumthani 1 rice seedlings grown under salt stress

Bundit Khunpona, Suriyan Cha-umb, Bualuang Faiyuec, Jamnong Uthaibutraa, Kobkiat Saengnila,*

ABSTRACT:     The ability of paclobutrazol to ameliorate salinity stress, growth performance, photosynthetic pigment, and antioxidant efficiency was studied in indica rice cv. Pathumthani 1. Fourteen-day-old rice seedlings were pretreated with 15 mg/l paclobutrazol by foliar spray and subsequently exposed to salt stress (150 mM NaCl) for 12 days. Salt stress decreased growth characters including fresh weight, dry weight, shoot length, root length, shoot fresh weight, shoot dry weight, root fresh weight, and root dry weight. It also reduced the photosynthetic pigments chlorophyll a, chlorophyll b, total chlorophyll, and total carotenoids. In addition, salinity stress decreased the total antioxidant capacity as determined by 2,2-diphenyl-1-picrylhydrazyl, 3-ethylbenzothiazoline-6-sulphonic acid, and ferric-reducing antioxidant power assays and reduced the activities of the antioxidant enzymes, peroxidase and polyphenol oxidase, in both leaves and roots. Seedling growth retardation and pigment degradation were positively correlated with the reduction of antioxidant efficiency under salt stress. Paclobutrazol pretreatment improved growth, pigment production, and antioxidant efficiency in salt-stressed rice seedlings. These results indicate that paclobutrazol plays an important role in ameliorating the impact of salinity stress on Pathumthani 1 rice seedlings.

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a Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand
b National Centre for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency, 113 Thailand Science Park, Pahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120 Thailand
c Department of Biology, Mahidol Wittayanusorn School, Salaya, Phuttamonthon, Nakhon Pathom 73170 Thailand

* Corresponding author, E-mail: kobkiat_s@hotmail.com

Received 31 May 2017, Accepted 25 Mar 2017