Maize Topmost Axillary Shoot Interference with Lower Ear Development In Vitro
1994
Interference by the topmost axillary shoot of maize (Zea mays L.) with the development of lower axillary shoots is well known. However, investigations with intact plants have not clarified whether this involves exertion of a growth retarding effect per se or is due, primarily, to the advantage that the topmost shoot has in competing for nutrients. These possibilities have now been examined by means of in vitro cultures. Topmost, second, and third axillary shoots of maize were excised between the stages of tassel emergence and silking and cultured separately for 11 to 15 d. In such cultures, relative elongation rates of the second and third ears were considerably faster than those of ears in corresponding axillary shoots on intact control plants
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