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苗期棉花抗黃萎病性品種篩選及光合特性的差異研究

時間:2019-06-30 08:20來源:畢業論文
篩選出對黃萎病抗性差異較大的 2 個棉花品種,研究 2 個棉花品種在黃萎病脅迫下的光合特性和葉綠素熒光特性的差異

摘要:【目的】篩選出對黃萎病抗性差異較大的 2 個棉花品種,研究 2 個棉花品種在黃萎病脅迫下的光合特性和葉綠素熒光特性的差異。【結果】( 1)篩選出的抗病品種為農大 601( ND-601)、泗抗 1號( SK-1),耐病品種為魯研棉 36( L-36)、魯研棉 28( L-28)、徐棉 21( XM-21),感病品種為泗棉3 號( SM-3),其中 ND-601 的抗性最強, SM-3 的抗性最差。( 2)黃萎病脅迫導致凈光合速率降低是氣孔限制和非氣孔限制共同作用的結果。 2 個棉花品種的光系統Ⅱ( PSⅡ)活性中心均受到損傷,其中 ND-601 受損程度低于 SM-3。( 3)在黃萎病脅迫下能夠保持較高的光能利用率,是抗病品種的抗性強于感病品種的原因之一。36759
畢業論文關鍵詞: 棉花;黃萎病;氣孔限制;非氣孔限制;光合特性
Screening of cotton Verticillium wilt resistant cultivars and research ofdifference of photosynthetic characteristics in seeding stage
Abstract: Verticillium wilt in cotton caused by Verticillium dahliae is a plant fungal soil-borne disease,which results in serious loss in yield yearly. Owing to lack of upland cotton anti-source of high resistanceand effective chemicals to defend the disease, this study aims to find out the resistance mechanism andfrom which some suggestions can be inferred in the disease protection. In this study, the photosynthesis andchlorophyll fluorescence characteristics of cotton in eight conventional cotton varieties from YangtzeValley were examined. The net photosynthetic rate, stomatal conductance and intercellular CO2concentration of SM-3 were reduced, while limited stomatal value and non limited stomatal value wereincreased. It suggested significant difference among all the indexes except the intercellular CO2concentration and limited stomatal value.As for the ND-601 under the light stress, the net photosyntheticrate and limited stomatal value were increased, stomatal conductance remained the same level, theintercellular CO2 concentration was decreased. There were no significant difference among all the indexesexcept the net photosynthetic rate. Under the severe stress, ND-601 was consistent with the trend of SM-3,which showed the difference is significant, but the decline was less than SM-3 under severe stress.Thestress of Verticillium wilt led the two cultivars Fv/Fm, Fv/F0, Y(II) and qL to decrease, NPQ to increase,but in ND-601 the range of these indexes was less than SM-3. The result indicated that the reason why theVerticillium wilt caused the decrease in the net photosynthetic rate was the result of the limited stomatalvalue and non limited stomatal value.Owing to the Verticillium wilt stress, the PSⅡ reaction center in twocultivars was damaged, but the degree in ND-601 was less than that of SM-3.
源¥自%六^^維*論-文+網=www.aftnzs.live

Key words: cotton; Verticillium wilt; limited stomatal value; non limited stomatal value; photosyntheticcharacteristics
目錄
摘要1
關鍵詞1
Abstract1
Keywords1
引言1
1材料與方法2
1.1供試材料2
1.2試驗設計2
1.2.1苗期水培篩選試驗2
1.3測定指標與方法3
1.3.1黃萎病病情分級標準及調查方法3
1.3.2光合、熒光測定方法3
1.3.3數據處理4
2結果與分析4
2.1黃萎病的發生情況4
2.2黃萎病脅迫對不同抗性棉花品種光合作用參數的影響4
2.2.1凈光合速率(Pn)4
2.2.2氣孔導度(C)4
2.2.3胞間CO2濃度(Ci)4
2.2.4氣孔限制值(Ls)4
2.3黃萎病脅迫對不同抗性棉花品種熒光動力學參數的影響4
2.3.1光系統Ⅱ的最大光合效率(Fv/Fm)4
2.3.2光系統Ⅱ的潛在活性(Fv/F0)5
2.3.3光系統Ⅱ的實際光合效率(Y(II))5
2.3.4非光化學淬滅系數(NPQ)5
2.3.5光化學淬滅系數(qL)5
3結論與討論5
3.1黃萎病脅迫對棉花光合特性的影響5 苗期棉花抗黃萎病性品種篩選及光合特性的差異研究:http://www.aftnzs.live/shengwu/20190630/35330.html
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