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Crop canopy development in maize (Zea mays L.) was studied to observe the occurence of individual leaf events (leaf primordia initiation, leaf tip appearance, and leaf collar appearance). The objectiv...e was to characterize factors controlling leaf development in a stand. Plants were grown in controlled environment chambers with day/night temperatures of 30/24, 26/20, and 19/14℃ with 16 hours of artificial daylight per day. The rates of the observed developmental events varied with leaf node number and exhibited a nonlinear dependency with temperature. The changes in the rate of development with temperature were described using modified degree-day (M_<dd>) thermal time scale where base temperatures (T_b) differed for air temperatures above (T_b=10) and below (T_b=7) 20℃. Leaf area growth duration was defined as the difference in time, or M_<dd>, between the appearance of a leaf tip and leaf collar. The response curve for leaf area growth duration vs. leaf position was quadratic; much like that for mature area per leaf vs. position which represents its suggestive cause and effect nature. Equations are presented which provide part of the information needed to construct a corn canopy dynamics simulation model.続きを見る
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Mendeley出力
KJ00004506763