Action of Maleic Hydrazide on Dormancy, Cell Division, and Cell Expansion.
نویسندگان
چکیده
Maleic hydrazide (MH) is of practical and theoretical interest as a growth-regulating chemical that can inhibit plant growth without causing obvious morphological abnormalities (13, 14). After recent reports of growth interactions between MH and gibberellic acid (GA) (2, 10), Brian and Hemming called attention to the many growth effects for which MH has actions opposite to those of GA (1). From studies of interactions of MH and GA on pea stem extension, these authors concluded that "MH prevents the response to GA of GA-sensitive plants" and that it is, therefore, likely that "MH inhibits growth by blocking some essential reaction at a stage preceding that where GA normally exerts its effect" (1). In these experiments, we have studied the effects of MH and compared them with those of GA on three systems: lettuce seed germination, mitosis in the absence of growth by expansion in dormant lettuce seeds (5, 7), and growth by cell expansion in the absence of mitosis in y-irradiated wheat (6). The results show that there is no specific interaction between MH and GA either on lettuce seed germination or on the growth of wheat seedlings, and MH seems to exert direct effects on cell division but not on cell expansion during seedling growth [which is in contrast to previously studied GA effects on these same systems (6. 7)]. Similarities between effects of MH and of ionizing radiation are noted.
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ورودعنوان ژورنال:
- Plant physiology
دوره 35 4 شماره
صفحات -
تاریخ انتشار 1960