Abstract
The study was conducted to standardize the methodology of humid priming for improving the seed germination and vigour of okra seeds and to compare the efficacy of different enhancement techniques such as hydro priming, spin priming, seed coating and the combination of ‘humid priming + seed coating’ in improving the seed vigour characteristics of okra (Abelmoschus esculentus L.). In order to standardize the humid priming technique, okra seeds were subjected to humid priming for four different duration’s viz., 2, 4, 6 and 8 h, shade dried to original moisture content and subjected to evaluation of seed germination under shade net conditions in raised beds. The results revealed that 4 h of humid priming was statistically significant to the rest of the durations, with respect seed germination and seedling growth. With respect to anatomical potential, the radicle length (3.39mm), cotyledon length (6.69mm) and cotyledon width (6.30mm), recorded by humid priming (4 h) was 62.2 %, 6.4 % and 2.6 % higher than control seeds. The second experiment conducted to compare the efficacy of hydro priming, spin priming, polymer coating and combination of humid priming + seed coating. The study revealed that seeds subjected to combination of humid priming (4 h) + seed coating (3g kg-1) recorded highest physiological potential in terms of germination percentage (87 %), seedling length (20.2 cm), dry matter production (421.3 mg), vigour index (1765), root volume (3.5 cm3) and root sheath (2.560 g) while the control recorded only 70 %, 15.1 cm, 328.7 mg, 1055, 2.0 cm3 and 1.532 g, respectively.
Highlights
Okra (Abelmoschus esculentus L.) is cultivated throughout the tropical and warm temperate regions of the world [1]
The first part of the experiment consisted of standardization of protocol for humid priming of okra seeds
Okra seeds soaked in water for 12 h were subjected to humid priming for four different durations viz., 2, 4, 6, 8 h
Summary
Okra (Abelmoschus esculentus L.) is cultivated throughout the tropical and warm temperate regions of the world [1]. Using of high quality seeds and adopting adequate management strategies are the most popular ways to increase crop production [3]. Seed invigoration treatments are physiological treatments that enable an improvement in physiological status of seed, thereby achieving high germination percentage [5]. In the last two decades, extensive research has been conducted to perfect the art of seed priming so as to enable the farmer to harness maximum benefit in terms of increased seed germination and seedling vigour. The humid priming technique is the process of soaking the seeds in a loosely tied cloth bag for predetermined duration of time, followed by placing the bags in a closed container on an elevated platform that allows to provide humid dark conditions that facilitate the invigouration process [10]. Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made
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