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研究生:夏宗蓓
研究生(外文):Hsia, Chung-Pei
論文名稱:影響大豆葉片老化因子之研究
論文名稱(外文):Studies on the Factors Influencing Soybean Leaf Senescence
指導教授:高景輝高景輝引用關係蔡文福蔡文福引用關係
指導教授(外文):Kao, Ching-HueiTsai, Wen-Fu
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:農藝學研究所
學門:農業科學學門
學類:一般農業學類
論文種類:學術論文
論文出版年:1977
畢業學年度:65
語文別:中文
論文頁數:97
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本論文就誘致大豆老化時,其影響因子所作初步研究。影響因子
如:品種,老化時溫度處理,採樣葉片之年齡與季節,荷爾蒙與鈣離
子處理,去根(由莖基都切除主根、側根或根瘤),去頂(切除頂芽
與真葉)處理,以及照光處理。研究結果簡述如下﹕
1.品種間葉圓片老化速度有差異,而對荷爾蒙(如cytokinins)
處理之趨勢則一致。
2.葉圓片老化時之溫度會影響老化進行速度。22℃與25℃老化甚
慢,至35℃達到最快速,由溫度影響可見老化時仍有旺盛之新陳
代謝作用。
3.種植後10—18天之葉圓片老化速度無差別。
4.黑暗處理加速葉圓片與植株上葉片之老化,而對葉圓片之加速效果
超過對植株上葉片之影響。
5.BA(0.02—2mg/l), kinetin(0.2—2mg/l)與GA3(2
—20mg/l)延緩葉圓片老化,ethrel(0.2—2mg/l)與ABA
(10(-6)—10(-5)M)加速葉圓片老化。auxins在低濃度時,如IAA
(0.002—0.02mg/l)與NAA(0.002mg/l),可延緩葉圓
片老化。
6.CaCl2(10(-2)M)降低葉圓片老化時有機物質之滲漏,不影響老化
現象,但可增加GA3之延緩老化效果。
7.BA,GA3,IAA對葉圓片老化之影響有季節性差異,葉圓片採
自短日生長之植株,其荷爾蒙之處理效果較大。
8.對葉圓片老化BA(0.2mg/l)與GA3(20mg/l)共同處理之
效應大於其單獨之效應。但小於累加效應。ABA(10(-5)處理則
降低BA,GA3與BA+GA3之延緩效果。
9.與完整之幼植株比較,幼植株切除根部(尤以側根)可加速初生葉老
化。去頂不去根則延緩之,二者同時切除則其老化之速度與完整之
幼植株無異。去根或去頂影饗子葉老化之情形與影響初生葉老化近
似。
10.幼植株去根後由莖基部處理荷爾蒙之結果顯示﹕BA(2mg/l)幾
乎可取代根之作用以阻止初生葉老化。GA3(0.2—2mg/l)更
加速初生葉老化,IAA隨季節之影響差異大。ABA(5×10(-6)
—10(-5)M)則顯著地加速葉片老化。
11.幼植株去根去頂後由莖基部處理GA3(2mg/l)仍更加速初生葉
老化,而且效果大於留頂去根者。
12.短日(11、12月)之幼植株去根後處理IAA,可延緩初生葉老化
,而長日(3月)之幼植株處理IAA則加速老化﹔若此時去根且
去頂再處理IAA(0.0002—0.002mg/l)則可延緩初生葉之
老化。
13.照光可延緩葉圓片老化,而光強度由250—2000lux效果無差別。
14.BA或GA3在光照下延緩葉圓片老化之效果更佳。
15.種植14—18天之葉片,照光延緩葉圓片老化之效果無差異,但
種植22—30天者照光延緩效果逐漸降低。
本論文尚就葉片老化與葉綠素,α—氨基態氮等組成分及組織膜
變異之關係,植株生長季節與荷爾蒙之關係,根、莖頂等營養器官對
葉片老化之意義,以及照光處理與荷爾蒙及葉齡對老化之關係提出討論。
The purpose of this thesis is to study the factors concerned in soybean leaf disc senescence, which include varieties, temperature, light, leaf age, hormones and ca++. The roles of roots, nodules, apical bud and trifoliolates on the senescence of soybean primary leaf were also investigated.
The main results are outlined as follows;
1. Different varieties show different senescence rates, but the senescence response of different varieties to hormones, cytokinin for example, is almost the same.
2. Senescence proceeds at maximum rate at 35℃, as judged by chlorophyll degradation. Data support the concept that senescence is an active metabolic process.
3. Leaf discs from 10- to 18-day old seedlings show very similar senescence rate. The most consistent senescence rate is found in leaf discs from 14- to 18-day old seedlings.
4. Judging by the change of chlorophyll, under dark condition 3eavesattached to the plant show slower senescence rate than leaf discs; while leaves attached to the plant under light condition sensesce slower than those under dark condition.
5. BA (0.02-2mg/l), Kinetin (0.2-2mg/l) and GA3 (2-20mg/l) retard the senescence of leaf discs, while ethrel (0.2-2mg/l) and ABA (10(-6)-10(-5)M) promote it. Auxins in the optimum concentration such as 0.002-0.02mg/l of IAA and 0.002mg/l of NAA also delay the senescence of leaf discs, but are not so effective as cytokinins and gibberellic acid.
6. CaCl2(10(-2)M) effectively decrease the leakage of organic materials from leaf discs, but does not retard chlorophyll degradation. When CaCl2 and GA3 were applied together, a remarkable synergistic increase in retarding senescence of leaf discs was observed.
7. The sensitivity of cytokinins, GA3 and IAA in retarding senescence of leaf discs varied with the time when leaf discs were sampled, leaf discs sampled from the plants grown under short day condition show more effective retarding response to BA, GA3 & IAA than those grown under long day condition.
8. BA & GA3 applied together delay senescence of leaf discs more effectively than BA & GA3 applied individually, but less than the addition effects of the BA & GA3. ABA decreases the retarding effects of BA, GA3 or BA+GA3.
9. Compared with intact 14-day old seedling, the senescence of primary leaves is promoted by removing roots (especially lateral roots), and is delayed in seedlings without apical bud and trifoliolate but with roots. No difference in primary leaf senescence is found between intact seedlings and seedlings without roots, apical bud, and trifoliolate. The effects of removing roots, apical bud and trifoliolates on the cotyledon senescence are in a manner similar to the primary leaves.
10. Results indicate BA can replace the roots to prevent senescence of primary leaves, while GA3 and ABA accelearate. The effect of IAA to replace roots in preventing senescence depends on the time young seedlings are grown.
11. Seedlings without root, apical bud and trifoliolates treated with GA3 accelerate the senescence of primary leaves, this accelerated effect of GA3 is more than that of seedlings without roots only.
12. IAA applied to seedlings without roots retards senescence of primary leaf in the seasons with short day-length (e.g. Nov., Dec.), but promotes, it in the seasons with long day-length (.e.g. Mar.). However, when roots, apical bud and triofoliolates are all removed from seedlings grown in long day condition, IAA in the range of 0.0002-0.002 mg/l will delay the senescence of primary leaves.
13. Light delays the senescence of leaf discs, and intensities in the range of 250-2000 lux suffice for the maximum effect.
14. BA or GA3 applied with light causes more effective retarding effect of senescence than BA or GA3 applied in darkness.
15. Similar light effect in retarding senescence of leaf discs from 14- to 18-day old seedlings was found. However, light effect is decreased when seedling age is 22- to 30-day old.
Relations between leaf senescence and changes of chlorophy, α-amino nitrogen or tissue permeability, between growing seasons of seedlings and hormones responses, and between light effect and hormones or leafage were discussed in detail in this thesis. Consideration about the roles of roots, apical bud and trifoliolates in regulating primary leaf senescence was also included.
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