engleski

Does the water content affect the performance index in the sunflower grain filling stage?

The study aimed to determine the justification for irrigation in the grain filling stage and determine the difference in sunflower hybrids' sensitivity to the lack of water. Hybrids 7, 11 and 12 were singled out as being more sensitive to drought conditions than other hybrids according to the maximum quantum yield of photosystem II (TR0/ABS) and hybrids 7 and 11 were considered sensitive to drought conditions according to PIABS. As water regimes proved to be significant sources of variation, irrigating sunflower plants in the grain filling stage is considered justified. Also, the significant differences between tested genotypes justify using chlorophyll a fluorescence parameters to select breeding material that could supplement the conventional process of testing sunflower genotypes during breeding in dry conditions.

Helianthus annuus; chlorophyll a fluorescence; drought; hybrid

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