SEED PRIMING AND EXOGENOUS APPLICATION OF SALICYLIC ACID ENHANCE GROWTH AND PRODUCTIVITY OF OKRA (Abelmoschus esculentus L.) BY REGULATING PHOTOSYNTHETIC ATTRIBUTES

Mohammad Saidur  Rhaman; Farjana  Rauf; Shaila Shermin  Tania; Md. Masudul  Karim; Ashaduzzaman  Sagar; Arif Hasan Khan  Robin; Arafat Abdel Hamed Abdel  Latef; Yoshiyuki  Murata

doi:10.18006/2021.9(6).759.769

Authors

Mohammad Saidur Rhaman Department of Seed Science and Technology, Bangladesh Agricultural University, Mymensingh-2202 https://orcid.org/0000-0003-0090-6665
Farjana Rauf Department of Seed Science and Technology, Bangladesh Agricultural University, Mymensingh-2202
Shaila Shermin Tania Department of Seed Science and Technology, Bangladesh Agricultural University, Mymensingh-2202
Md. Masudul Karim Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-22023
Ashaduzzaman Sagar Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-22023
Arif Hasan Khan Robin Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh-2202
Arafat Abdel Hamed Abdel Latef Botany and Microbiology Department, Faculty of Science, South Valley University, Qena 83523, Egypt
Yoshiyuki Murata Department of Bio-functional Chemistry, Okayama University, Okayama, Japan

DOI:

https://doi.org/10.18006/2021.9(6).759.769

Keywords:

Chlorophyll contents, Hormonal priming, Photosynthesis, Seed priming, Salicylic acid

Abstract

Low and uneven germination is a serious problem for the successful production of okra seedlings. Priming of seeds as well as supplementation of different plant growth regulators exhibited better response in successful seedling production which eventually results in higher yield. Therefore, the present study was conducted to evaluate the effects of seed priming and exogenous application of salicylic acid (SA) on okra seed germination and plant development. The okra seeds were primed by 1 mM and 2 mM of SA for 60 minutes whereas the seeds were washed several times with distilled water for the control treatment. Similar doses of SA have been exogenously sprayed to the 12 days okra seedlings for 4 days. The results of the study revealed that seed priming with SA enhanced germination percentage (GP), increased coleoptile length and weight, shoot and root length, and seed vigor index (SVI). Similarly, exogenous application of 1 mM SA increased relative water content (RWC), contents of chlorophyll a, chlorophyll b, total chlorophyll while a higher dose of SA (2 mM) degraded the leaf pigments. Supplementation of SA altered photosynthetic attributes, net photosynthetic (Pn) and transpiration rate (Tr), stomatal conductance (Gs), and water use efficiency (WUE). Moreover, SA treatment reduced the time duration of flower bud initiation and days to first flowering and enhanced the yield per plant. The results of this study indicated that seed priming and exogenous application of SA enhanced germination and okra productivity by regulating RWC and photosynthetic attributes where 1 mM SA is more effective compared to 2 mM SA.