PJB-1993-25
EFFECTS OF ONTOGENETIC STAGES, LEAF POSITION AND COLOUR RATING ON CO2 ASSIMILATION IN PHASEOLUS VULGARIS L., UNDER FIELD CONDITIONS
G.H. JAMRO, G.S. POSYPANOV*, V.N. POSYPANOV AND T.P. KOBZVA
Abstract
CO2 assimilation rate in beans (Phaseolus vulgaris L) was investigated under field conditions. The rate of CO2 assimilation in leaves was significantly affected by ontogenetic stages, leaf position and their interactions. Maximum CO2 assimilation rate (15.332 mg CO2/dm-2 hr-1 was recorded at flowering stage followed by budding whereas, among the leaf positions. the higher rate of (14.985 mg CO2/dm-2 hr-1 was observed in upper leaves followed by central and lower leaves. Both leaf area and dry matter accumulation was higher at the pod forming stage, highest CO2 assimilation was recorded in deep green leaves followed by light green and yellow leaves. CO2 assimilation rate drastically reduced after pod formation as the case with dry matter accumulation and leaf area. CO2 assimilation was maximum in upper as well as deep green leaves as compared to lower leaves with light green or yellow colouring.
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