頁籤選單縮合
| 題 名 | 玉米高粱光合作用始源(Source)與光合作用積儲(Sink)關係之研究(1):同化作用始源之控制 |
|---|---|
| 作 者 | 陳琇瑜; | 書刊名 | 中華農學會報 |
| 卷 期 | 104 1978.12[民67.12] |
| 頁 次 | 頁13-24 |
| 關鍵詞 | 玉米; 光合作用始源; 光合作用積儲; 同化作用始源; 高粱; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 玉米、高粱二作物,在開花期除去葉片以控制同化作用始源,進行調查除去葉片後對單株子實產量及其成分影響;同時調查其殘留葉片之淨同化作用率的效變。玉米或高粱約50%田間植株吐絲或開花後,則利用剪刀依著葉片位置或同一葉片依不同時期及不同程度方式進行切除。 玉米、高粱吐絲開花後葉片的存在與大小對單株子實產量有直接控制作用,開花期切除葉片減產最大,愈近成熟影響愈小。開花期切除葉片減產主要由於果穗粒數之減少;而開花後期切除葉片減產則由於粒重之減少。不同位置葉片對單株子實產量影響亦不相同。一般上半部葉片較下半部葉片對子實產量影響大。劍葉對子實產量之影響,不僅與本身光合作用有關,劍葉與果穗在植株上相對位置亦為重要。 切除葉片不但減少子實產量,同時子實內糖分及粗蛋白質略為增加。但是澱粉含量卻顯著減少。 切除葉片後可使在植株上殘留葉片之淨同化作用率提高,同時延遲其葉片之老化,其原因亦附帶討論。 |
| 英文摘要 | This study was undertaken to determine the effect of leaf removal after 50% of silking or anthesis of varying source on the rate of dry matter accumulation in seed of corn and sorghum. Information on leaf removal influencing net assimilation rate of the remaining leaves was also investigated to help identify yield limiting processes. Defoliation was begun 10 days after 50% silking or anthesis, and continued at 10-days intervals for the next 40 days. Leaves removal treatments also consisted of removeing their existing position and degree of its proportion. The existing leaves and size after silking, or anthesis was directly affected in yield production at both crops. Defoliation during silking or anthesis resulted in a greater reduction grain yield and primary due to a decrease in kernel number. Late defoliation at closed maturity stage had no much effect on yield which mostly due to a decline in kernel weight. Leaves removal on existing position related to dry matter translocation into grain at both crops were significantly different. Generatlly, upper leaves should more direct influence than lower leaves to grain yield. The effect of flag leaf on grain yield depend on its photosynthetic capacity and the flag leaf with relative position of ear. The leaf removal treatment decreased in yield and resulted in slightly increasing in seed sugar and crude protein but starch content decreased. Partial removal of leaves enhanced the net assimilation rate of the remaining leaf and delayed their leaf senescence. The possible causes were also interpreted and discussed. |
本系統中英文摘要資訊取自各篇刊載內容。