MATURATION OF STAMENS AND OVARIES ON CULTURED EAR INFLORESCENCES OF MAIZE (ZEA-MAYS L) - INVITRO MATURATION OF MAIZE FLOWERS

Observations were made on the maturation of stamens and ovaries from cultured maize (Zea mays L.) ear inflorescences. Immature ears (5.1-10.0 mm long) of maize were cultured in kinetin medium to study microsporogenesis and pollen maturation in developing stamens. Male spikelets developed on ears cultured in kinetin medium. Meiosis-I began by 7 days of culture in the developing anthers and the mature tri-nucleate pollen grains were developed by 20 days of culture. Further, kinetin was required in the culture medium for at least initial 5 days to obtain the microspores in differentiated stamens. To observe the embryosac formation in developed ovaries, ears were cultured in control, kinetin (10.1-15.0 mm long ears) medium, and kinetin + gibberellic acid (5.1-10.0 mm long ears) medium. Formation of embryosacs was noticed in the developed ovaries which were sampled after 20 days of culture. This differential flower development using two growth regulators provides an opportunity to uncover the biochemistry and physiology of micro- and mega-gametophyte development in maize. © 1990 Kluwer Academic Publishers.