Effect of different foliar zinc application at different growth stages on seed zinc concentration and its impact on seedling vigor in rice |
| |
| Authors: | Panomwan Boonchuay Ismail Cakmak Benjavan Rerkasem |
| |
| Institution: | 1. Agronomy Division, Department of Plant Science and Natural Resources, Faculty of Agriculture , Chiang Mai University , Chiang Mai 50200 , Thailand;2. Faculty of Engineering and Natural Sciences , Sabanci University , Istanbul 34956 , Turkey;3. Plant Genetic Resources and Nutrition Laboratory , Chiang Mai University , Chiang Mai 50200 , Thailand |
| |
| Abstract: | This study evaluated how zinc (Zn) concentration of rice (Oryza sativa L.) seed may be increased and subsequent seedling growth improved by foliar Zn application. Eight foliar Zn treatments of 0.5% zinc sulfate (ZnSO4?·?7H2O) were applied to the rice plant at different growth stages. The resulting seeds were germinated to evaluate effects of seed Zn on seedling growth. Foliar Zn increased paddy Zn concentration only when applied after flowering, with larger increases when applications were repeated. The largest increases of up to ten-fold were in the husk, and smaller increases in brown rice Zn. In the first few days of germination, seedlings from seeds with 42 to 67?mg Zn?kg?1 had longer roots and coleoptiles than those from seeds with 18?mg Zn?kg?1, but this effect disappeared later. The benefit of high seed Zn in seedling growth is also indicated by a positive correlation between Zn concentration in germinating seeds and the combined roots and shoot dry weight (r?=?0.55, p?
|
| |
| Keywords: | rice foliar application seed zinc seedling growth ZnSO4 |
|
|
