| 张成军,陈国祥,黄春娟,姚金保.干旱对高产小麦宁麦9号旗叶光合特性的影响[J].干旱地区农业研究,2005,(3):24~27 |
| 干旱对高产小麦宁麦9号旗叶光合特性的影响 |
| Effects of drought on photosynthetic properties in flag leaves of a high-yield wheat variety Ningmai 9 |
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| DOI：10.7606/j.issn.1000-7601.2005.03.05 |
| 中文关键词: 干旱胁迫 高产小麦 抗旱性 叶肉导度 水分利用效率 |
| 英文关键词:water stress wheat (Triticum aestivum L.) drought resistance mesophyll conductance water use efficiency |
| 基金项目:国家自然科学基金(30270792)； 江苏省高校自然科学研究计划项目(02KJB180006) |
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| 中文摘要: |
| 通过土壤自然干旱法,以共有一亲本但产量较低的宁麦8号为对照,研究了高产小麦宁麦9号旗叶光合特性。结果表明,土壤相对含水量RWCS、叶片相对含水量RWCL、净光合速率Pn、气孔导度gs、蒸腾速率E以及叶肉导度gm在整个自然干旱过程中不断降低;在干旱前8d,胞间CO2浓度Ci降低,水分利用效率WUE增加,而在干旱的8～12d,Ci增加,WUE降低。Pn与gm的变化呈显著的正相关(R2=0.938,P<0.0001),而与gs无明显的相关性。因此,在土壤干旱胁迫下,叶肉导度gm是抑制Pn的主导因素,而gs的影响较小。和宁麦8号相比,宁麦9号具有较高的Pn、gs、gm、WUE和较低的E。因此,较高的光合能力、水分利用效率以及较强的抗旱性可能是宁麦9号高产的生理基础,而其抗旱性强可归结为水分利用效率较高。 |
| 英文摘要: |
| The experiment was conducted under drought condition (water withholding) to investigate the photosynthetic parameters in flag leaves of the high-yield wheat (Triticum aestivum L.) varieties Ningmai 9, using Ningmai 8 as control. The results showed that in the course of water withholding, there were constant decreases in relative water content of soil (RWCS), leaf relative water content (RWCL), net photosynthetic rate (Pn), stomatal conductance (gs), transpiration rate (E), and mesophyll conductance (gm, calculated as the ratio of Pn to Ci). During 08 d of water withholding, subcelluar CO2 concentration (Ci) decreased and water use effiCiency (WUE) increased, whereas during 812 d of water withholding, Ci increased and WUE decreased significantly. There was a close positive correlation between Pn and gm (R2=(0.938,) P<0.0001), but no clear correlation between Pnand gs was observed. It could be concluded that under both mild and serious drought conditions, non-stomatal limitation may be the primary factor to inhibit photosynthesis, rather than stomatal conductance. Compared with Ningmai 8, Ningmai 9 had a higher Pn, gs, gm and WUE, and a lower E. Moreover, drought induced a slower decrease in Pn in Ningmai 9 than in Ningmai 8, indicating a stronger drought-resistance in the former. Therefore, the properties of high photosynthetic capacity, WUE and drought-resistance may be the physiological basis of high-yield in Ningmai 9, whose drought-resistance could be attributed to the high water use efficiency. |
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