Effects of gamma irradiation on in vitro germination and ultrastructure of apple pollen

Effects of Radiation and Growth Hormones on Pollen Germination, Pollen Tube Growth and Modulation of Radiation Responses of Pinus kesiya Royle ex Gord.

“…Therefore, for manifestation of radiation caused lethal effects inactivation of more than one target (key molecules, cellular components etc.) would be required (Arena 1971, Speranza et al 1982. This may be the reason for high degree of radioresistance of P. kesiya pollen.…”

“…In this investigation 5 Gy radiation dose therefore belongs to the (a) category while 7.5-40 Gy doses are of category (b) and doses 50 Gy and above correspond to (c) category of Seibold et al (1979), respectively. In radiation investigation pollen is considered a multitarget system (Speranza et al 1982). Therefore, for manifestation of radiation caused lethal effects inactivation of more than one target (key molecules, cellular components etc.)…”

“…(Katiyar and Chauhan 1987a, b, Livingston and Stettler 1973, Michie and Bohm 1989, Cuny and Roudot 1991, Dennisen and Den Nijs 1987, Pfahler 1971, Speranza et al 1982. Stimulatory effect of radiation are still ill-understood (Michie and Bohm 1989).…”

Radiation-induced pollen germination, tube growth, its localized cytochemical constituents, fruit set and fruit size in alkaloid yielding species Solanum torvum L.

“…Radiation-induced reduction of pollen tube growth has been reported in other species also (Pfahler 1971 Nijs 1987). Speranza et al (1982) suggested that the radiation-induced reduction of pollen tube growth may be dependent on the damage of nuclei or cytoplasm. Recently, Denissen and Den Nijs (1987) emphasized that the metabolic processes are essential for pollen germi nation and tube growth of Cucumis sp.…”

Pleiotropic Effects of .GAMMA.-Irradiation on In vitro Pollen Germination and Fertility in Soybean

“…Speranza et al (1982) suggested that the radiation-induced reduction in pollen tube growth might be dependent on the damage of nuclei or cytoplasm. It has also been reported that the normal pollen development depends on the close interaction with the tapetal tissue that compose the innermost layer of the anther, which plays an important layer in microsporogenesis, since the tapetum supplies nutrients necessary for pollen development (Dickinson 1992) and provides the precursors of exine formation (Shivanna andJohri 1985, Ahmed et al 1992).…”