Showing papers in "Indian journal of plant physiology in 1983"

Influence of soil salinity on morphology, rate of carbon assimilation, photosynthetic products and enzyme activities in a sorghum hybrid CSH-5

Abstract: Effect of different levels of soil salinity on growth, stomatal response, 14CO2 assimilation, products of steady state photosynthesis and activity of main photosynthetic enzymes in a sorghum hybrid were investigated. Soil salinity adversely affected the photosynthetic area and rate of C assimilation. The lowered photosynthetic ability under salt stress conditions was due to stomatal closure inhibiting chlorophyll synthesis and to decreased activity of PEP and RuBP carboxylases. Excessive accumulation of malate during steady state photosynthesis could be correlated with the possible inhibition of malic enzyme. The reduction in yield was attributed to the low rate of photosynthesis and reduced synthesis of sugars. It was concluded that hybrid CSH-5 is salt sensitive and gives negligible yield with soil salinity of EC >1.6 ds/m.

Ear photosynthesis in long glumed and normal glumed genotypes of finger millet (Eleusine coracana Gaertn.)

Abstract: The rate of ear photosynthesis at different stages of recent development Studied in flnger millet gentotypes differing distinctly in glume size. In long glume types. CO2 fixation rate by the ear was significantly higher. In long glume genotypes GE 2973, the increase in photosynthetic rate was 228 and 43 pet cents over the check......

Path coefficient analysis and heritability of photosynthetic rate and associated leaf characters in rice varieties

Abstract: Considerable variation in photosynthetic rates was observed among 32 traditional tall rice varieties while differences were not significant among 16 short statured high yielding varieties (HYV). The maximum rates of even 50-55 mg CO.dm-fhr-1 were recorded in tall rice, Plb 10. Co 13. Peta and Mahsuri. Leaf photosynthetic rate (Po) was significantly associated with chlorophyll cont(n\" leaf nitrogen (NLA). shorter interveinal distance (IVD) and specific leaf weight (SLW). The relationship with either stomatal frequency or size was loose. Path coefficient analysis revealed that IVD strongly influences Po in traditional tall types. The photosynthetic rates are her'table but with high phenotypic variance. Thus. for rapid field selection shorter IVD may serve as an index for greater photosynthetic efficiency especially in the tall types.

Physiological studies on seed setting in sunflower. I: Photosynthesis and nitrate assimilation

Abstract: Photosynthese et assimilation des nitrates sont etudiees chez 2 genotypes d'Helianthus annuus en relation avec leur rendement en graines