ABSTRACT
In present paper, an attempt has been made to establish the role of insect pollinators in the context of reproductive biology and seed set in coriander. Early morning pattern of flower anthesis with 1460±117 pollen per flower (log value 3.16) were noticed. Pollen-ovule ratio was ca. 730:1. Different insects like Apis cerana indica, A. dorsata, Megachile sp, and members of Diptera and Coleoptera usually visit the flowers for forage. The seed settings were 92.55±8.07%, 60±7.6%, and 29.74±4.8% in control (open pollination), netted flowers, and bagged flowers respectively, indicating the role of insects for increased seed production. SEM studies revealed that morphological features of pollen and stigma corroborate each other for successful fitness with regard to effective pollen-pistil interaction. The best in vitro germinating pollen (42±6.74%) with pollen tube length (161±27.56 mm) were obtained in 20% sucrose supplemented with 100 mg/ml boric acid. Salts of Ca, Mg, and K did not show any effect. Stigma receptivity was measured at different time intervals after flower opening in terms of the highest number of in vivo germinating pollen grains. Stigmas were receptive maximum (50%) during third day after flower anthesis, showing 51.1% in vivo germinating pollen with 94.2mm long pollen tube.
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