Morphological characterization and pollen –pistil interaction in selected genotypes of sunnhemp (Crotalaria juncea L.)
Abstract
Thirty six morphological characters consisting of sixteen biometrical and twenty qualitative characters were studied in six genotypes of sunnhemp (Crotalaria juncea L.), a fibre cum green manure crop of the tropics. Of the six genotypes, CO 1 was the earliest to flower while, JRT 610 was the last one to flower. Petal patternings were observed only on the standard petals of SUIN 037 and CO 1. SUIN 053 out-yielded all other genotypes for seed yield. The stigma receptivity was found to vary between genotypes at different stages of flower development. It was very low in K 12 Yellow up to the stage of flower showing initiation of the emergence of standard petal and in other genotypes, stigma receptivity was either low or medium in the same stage. However, it was high or very high in fully opened flowers of all the genotypes. When the pollen grains of five genotypes namely SUIN 053, SUIN 037, K 12 Yellow, JRT 610, CO 1 were used for pollinating the genotype SN 23, the pollen tube growth of SUIN 037 was the fastest to reach the ovary of SN 23.
Key words:Crotalaria juncea, Sunnhemp, Floral characters, Pollen germination, Pollen-pistil interaction
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