Elevated Temperature Affects Axillary Meristem Development in Dendranthema ×grandiflorum 'Improved Mefo'

in HortScience
View More View Less
  • 1 Department of Environmental Horticulture, University of Florida's Institute of Food and Agricultural Sciences at the West Florida Research and Education Center, Milton, FL 32583-1721

Effects of heat stress on viable and nonviable axillary meristem development and subsequent lateral branching in 'Improved Mefo' chrysanthemum [Dendranthema ×grandiflorum Ramat. (Kitamura)] were studied. Plants grown at 33 °C day/27 °C night produced more nonviable buds than did plants grown at 23 °C day/18 °C night. A negative linear relationship {y = 28.7 + [-0.66 (x days)], r2 = 0.70} between timing of exposure to high temperatures and the number of nonviable buds was observed. Histological examination 28 days after exposure to 33 °C/27 °C revealed that plants showed both normal and abnormal bud development. Abnormal bud development occurred as a consequence of premature differentiation of axillary meristematic tissue into nonmeristematic parenchyma tissue immediately after separation of axillary from apical meristems.

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 137 17 3
PDF Downloads 146 45 3