Photosynthetic performance responses in different phyiological development stages of some Brassica juncea genotypes in field condition

Abstract

In this study Brassica juncea genotypes were planted as fall sowing at the experimental fields located at Yenimahalle-Ankara location based on randomized block design. In order to investigate photosynthetic performances of three B. juncea genotypes; net photosynthetic rate = P N [μmol(CO 2) m-2 s-1 ], transpiration = E (mmol m-2 s-1), stomatal conductance = g s (mmol m-2 s-1), intercellular/ambient CO 2 air= C i [μmol (CO 2) mol-1 (hava)], mesophyll conductance= g m [mmol(CO 2)/m 2 s 1 ] and photosynthetic water use efficiency = PWUE [μmol(CO 2)/mol(H 2 O)] parameters (model LCi Photosynthesis System, ADC Bioscientific Ltd., Hertfordshire, UK) were measured and phenological aspects were recorded at different physiological stages as booting, anthesis and grain filling during experiment. Photosynthetic rate and stomatal conductance were associated with seed yield in B. juncea genotypes and the selection of genotypes with high gas exchange may provide development of mustard (B. juncea) genotypes with high yield.