The relationship between chlorophyll a fluorescence parameters and yield components in sunflower hybrids

The sunflower is considered one of the four most important oilseeds globally. study was conducted on 16 hybrids in field conditions to link photosynthesis parameters with yield components using chlorophyll a fluorescence (ChlF), content, leaf temperature and agronomic traits. By analysing ChlF flowering stage hybrids, statistically significant difference found between studied for all except photosynthetic efficiency index energy required from exciton reduction ultimate electron acceptors photosystem I (PItotal). At same time, results confirmed significance temperature, traits hybrids. indicators showed correlation which can reduce final (RE0/ET0), PItotal plant height. Also, number seeds per head positive very variable step (VI) highly negative flow reduces end acceptor side (RE0/RC). Using these analyses breeding programmes could improve productivity performance optimisation under changeable growing conditions.