Seed priming to enhance seed germination of purple upland rice
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Abstract
Purple upland rice has been of interest due to it contains antioxidant substance such as anthocyanins.
Upland rice is commonly sown by dry direct seeded method in dry seedbed. This results in uneven field emergence and lower seed yield. This study aimed to investigate seed priming method in attempt to improve field establishment. Water imbibition pattern, imbibition periods, 24 and 48 h were compared among priming treatments including soaking seeds in NaCl (-1.25 MPa), CaCl2 (-1.25 MPa), polyethylene glycol (PEG 8000) (-1.5 MPa), 300 times diluted wood vinegar (WV), distilled water and unprimed or dry seed as a control treatment. Results revealed that three purple upland rice, Leum Pua, ULR 038 and Maled Pai primed with NaCl, CaCl2, PEG or WV imbibed water faster than primed seed with distilled water. Phase II of water imbibition ended earlier when seeds were primed in WV (ULR 038) or in NaCl or WV for Maled Pai. Soaking seed for 24 h had a higher seed germination percentage, compared to 48 h soaking when germination was set immediately after soaking. However, effect of different soaking periods was not evident when germination was set after primed seed was dried to initial moisture content. Seed priming with NaCl, CaCl2, PEG and WV increased germination compared to unprimed seed or dry seed. Effect of seed priming with WV was more pronounced than other priming methods during storage of primed seed under ambient condition.
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