Role of presowing seed treatment on germination, seedling growth and longevity of ber (Zizyphus mauritiana Lam) seeds.
In West Bengal, India, pre-treatment with GA at 200 ppm was found effective in increasing germination and extending seed longevity of ber. Maximum germination of 98.76 and 77.82% was obtained with seeds pre-treated with 200 ppm GA, sown at 1 and 17 months after treatment, respectively, whereas untreated seeds recorded 86.23 and 24.58% germination in the 2 respective sowings. Germination was faster with 1% thiourea, but short duration of germination was noticed in seeds pre-treated with chlormequat (1000, 2000 ppm). Gibberellic acid separately and in combination with nutrient (composed of 1% Microshakti and 1000 ppm K2HPO4) caused maximum seedling growth. Gibberellic acid at 400 ppm and chlormequat at 1000 ppm increased the extent of polyembryony in seeds. Authors' summary. KEYWORDS: TROPAG | Ziziphus mauritiana | Fruit and Nut Crops | Ziziphus | germination | seedlings | seed longevity | plant growth substances | India | West Bengal.