Growth Response of Orchardgrass (Dactylis glomerata L.) to Different Light and Temperature Environments. I. Leaf Development and Senescence1
- T. H. Taylor,
- J. P. Cooper and
- K. J. Treharne2
Orchardgrass, represented by ‘Boone,’ ‘Aberystwyth S-143,’ and a Portuguese ecotype, was observed through the tenth-leaf stage in a growth chamber experiment. Plants were started from seed and grown in boxes of soil. Temperatures of 29/21 C (85 F day/72 F night) or 21/13 C (70/55 F) had similar effects on leaf appearance on the main shoot. Leaves appeared more rapidly in the 16,140 than the 10,760-lux light environment. Boone produced leaves at a faster rate than did S-143 or Portuguese. Leaf area was influenced by light, temperature, and variety, and interactions of lights ✕ temperatures and varieties ✕ temperatures were observed. Increased leaf area represented mainly increases in length rather than in width of leaf blades. Leaves senesced more rapidly in the 16,140- than 10,760-lux light, 27 and 31 days, respectively. Leaf senescence was not affected by temperature or variety. Boone reached the tenth-leaf stage sooner, had greater leaf area and was higher yielding than S-143 or Portuguese. Plants grown in the 21/13 C environment produced more aerial dry matter and had a larger leaf surface than did plants under the 29/31 C regime.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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