|Title:||Relationship of Plant Growth and Chlorophyll Content in Field-grown Rice||Other Titles:||田間水稻葉綠素含量與生長之關係||Authors:||Yuh-Jyuan Lee
|Keywords:||水稻(Oryza sativa L.);鮮重;植株生長;葉綠素含量;色素比例||Issue Date:||25-Sep-2000||Publisher:||中華農業氣象學會||Journal Volume:||6||Journal Issue:||4||Start page/Pages:||191-200||Source:||中華農業氣象||Abstract:||
Changes of chlorophylls and fresh weight in leaf blade and whole plant of 5 rice genotypes were measured at the experimental farm of Taiwan Agricultural Research Institute during the first (1st) and the second (2nd) cropping seasons of 1998. The objectives were to study the correlation between chlorophyll content and plant growth and its seasonal variation. The ratio of chlorophyll a to chlorophyll b was also determined to clarify the role of pigmentation relationship during rice growth. It was shown that rice plants began with lower chlorophyll content, increased as plant develops, and decreased when plant aged. Pattern for seasonal chlorophyll variation is best fitted by the Gaussian function, with the determining factors (R) greater than 0.89. The total chlorophyll was higher in the 2nd crop than in the 1st crop and level of chlorophyll content was higher in the whole plant than in leaf blade. After excluding the influence of growth rate between crops, Gaussian function is also fitted to seasonal changes in total chlorophyll on the unit time baseline. Seasonal changes of fresh weight in leaf blade and whole plant followed a similar best fit curve pattern to the total chlorophyll. Plants grown in the 2nd crop had higher fresh weight values than those grown in the 1 crop at the relative transplanting days and unit time baseline. By regression analyses, it revealed a closed positive correlation (R^O.82) between fresh weight and total chlorophyll. The linear relationship shows that the amount of total chlorophyll had a pronounced effect on values of fresh weight in both cropping seasons. However, at the same chlorophyll content, rice plants grown in the 1 1 crop supported a higher fresh weight than those grown in the 2nd crop. By further analyze leaf and whole plant pigmentation (chlorophyll a and chlorophyll b) during plant growth, it was found that the ratio of chlorophyll a/b was a linear function, decreasing after transplanting. Plants grown in the 1st crop had higher values in green-to- yellow pigment ratio than those grown in the 2nd crop.
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