水稻光合作用及呼吸作用之研究

Abstract

本試驗以臺南5號及臺中和13號為材料，於三個年度期間，利用生長分析法及氣體交換注來探討臺中地區第一、二期作，最大分蘗期後之生育形態、光合成因子、光合作用、暗吸呼作用、光呼吸作用及個體群乾物質等項目之變化，以及其與收穫組成要素的關係，結果如下：(一)兩稻種乾物重之變化相似；年度間之變化大於期作間之變化。(二)第二期作稻谷產量低於第一期作約25%，可能由於二期作自孕穗期後之低淨光合率及高暗呼吸作用，有效同化物輸送至谷粒量減少，導致最後產量構成要素不良；切穗數、結賓粒數、結賓粒重、總粒重、結實百分率及總乾重等項目的低落。 The growth analysis, CO2 exchange rate, and yield main components of the first and second season Tainan No. 5 and Taichung Sen No. 3 rice cultivars were determined for three year period. The results indicated that : (1) The similar tendency of dry weight change for year period was higher than the season change. (2) The grain yield of the second season rice was lower than the first season one. The reason was the low net assimilation rate of the second season rice. This led to the small yield main components, such as number of panicles, total number of ripened grains, weight of ripened grains, and total weight of grains.