Photosynthetic activity and remobilisation of nutrients during the reproductive phase of rice are detrimental factors, directly linked with crop productivity. The objective of this study was to determine the priming efficacy on different physiological features such as generation of reactive oxygen species (ROS), accumulation of malondialdehyde, activities of enzymatic and content of non-enzymatic antioxidants and chlorophyll a fluorescence measurements at booting, silking and mature stages of rice in response to UV-B and halo priming. Seed priming reduced the excess ROS generation and oxidative stress through positive regulation of the antioxidation mechanism. The effective antioxidant machinery in UV-B and halo primed plants ensured that the photosynthetic process proceeded uninterruptedly, ensuring the efficacy of the same even when encountered with oxidative stress. The present study proves that halo and UV-B priming of seeds reduced panicle sterility, increased the harvest index, at the reproductive phase of the plant. Halo and UV-B priming retained priming imprints throughout the plant life cycle ultimately leading to the increased yield-related parameters in Vyttila 6.
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