Does halopriming improve germination and seedling vigour in marigold (Tagetes spp.)
Marigold is one of the important annual flowers grown for commercial purposes all over the world. A fast decline in vigour and viability of marigold seeds is a main problem under ambient storage conditions. Little information has been reported on seedling development of marigold subsequent to priming. Therefore, a laboratory study was carried out to investigate the influence of various priming strategies with osmotica (50mM CaCl2, 50mM NaCl, 50mM KNO3) on germination and seedling growth of African and French marigold seeds. Halopriming with 50mM CaCl2 for 24 h maximally increased final germination percentage, germination index, shoot, root length and fresh weights of seedlings of both marigold species as compared to all pre-sowing seed treatments including control. Seeds of both marigold species primed with 50 mM CaCl2 for 24 h significantly reduced mean emergence time and days to 50% emergence, increased seedling emergence uniformity, final seedling emergence percentage and seedling growth. In conclusion, different salts used for priming improved germination potential and seedling establishment, however, CaCl2 proved to be the most effective priming agent in both marigold cultivars. This could be attributed to the effect of lower electrical conductivity of seed leachates, higher reducing and total sugars as well as higher α-amylase activity in haloprimed seeds.
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Document Type: Research Article
Publication date: July 1, 2009
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