| 周玉乾,寇思荣,连晓荣.甘肃敦煌绿洲区干旱胁迫下玉米抗旱性与灌浆期光合特性[J].干旱地区农业研究,2016,34(4):112~117 |
| 甘肃敦煌绿洲区干旱胁迫下玉米抗旱性与灌浆期光合特性 |
| Drought resistance and photosynthetic characteristics of maize at grain-filling stage at Dunhuang Oasis, Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2016.04.17 |
| 中文关键词: 干旱胁迫 玉米 抗旱性 光合特性 |
| 英文关键词:maize drought stress drought resistance photosynthetic characteristics |
| 基金项目:科技部农业科技成果转化资金项目(2011GB2G100006)；甘肃省科技支撑计划(1104NKCA100) |
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| 中文摘要: |
| 在年降雨量不足40 mm的甘肃省敦煌市绿洲农业区，采用大田干旱胁迫法对玉米品种陇单9号、先玉335、陇单10号、沈单16进行了抗旱性及灌浆期光合特性的研究。结果显示：(1) 干旱胁迫和充分供水条件下， 4个参试品种间除单株穗数差异不显著外，其余形态性状及光合特征参数间差异较大，干旱胁迫后，4个参试材料平均株高降低了40.25 cm，生物量、穗重、穗粒重、穗粒数分别减少了132.87 g·株-1、90.48 g、79.15 g、167.59粒，差异达到了极显著水平，百粒重、穗数、出籽率分别减少了3.75 g、0.08个、7.75%，差异不显著；光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）及叶绿素含量随品种抗旱性减弱呈降低的趋势，而胞间CO2浓度(Ci)在4个品种间变化较小。(2) 抗旱性综合评价值的计算结果表明，4个参试品种的抗旱性依次为先玉335（抗旱）＞陇单9号（中度抗旱）＞沈单16（弱抗旱）＞陇单10号（弱抗旱）。(3) 相关及逐步回归分析显示，灌浆期光合速率与不同抗旱类型玉米品种的抗旱性显著相关，而胞间CO2浓度与抗旱品种陇单9号、先玉335的抗旱性相关性较大，叶绿素含量与弱抗旱品种陇单10号、沈单16的抗旱性极显著相关。 |
| 英文摘要: |
| Field experiment was conducted at Oasis Agricultural Area of Dunhuang City, Gansu Province where annual rainfall is less than 40mm. Maize cultivars,Longdan No.9 , Xianyu No.335, Longdan No.10, and Shendan No.16 were used to evaluate drought resistance and photosynthetic characteristics during grain-filling stage. The results showed that: (1) Apart from spike number, morphological traits and photosynthetic parameters were significantly different among 4 cultivars under drought stress and adequate water supply. After drought stress, the average plant height of cultivars was decreased by 40.25 cm, biomass, weight of spike, weight of grain, number of grain by 132.87 g, 90.48 g, 79.15 g, 167.59,100 grain weight, panicle number, seed yield reduced by 3.75 g, 0.08, 7.75%. As drought resistance decreased, photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and chlorophyll content decreased. (2) D value of comprehensive evaluation of drought resistance showed that drought resistance order ofwas Xianyu No.335, Longdan No.9, Shendan No.16, Longdan No.10. (3) Correlation and stepwise regression analysis showed that drought resistance and transpiration rate in grain-filling stage were significantly correlated for the four cultivars. |
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