淹渍对花椰菜根系活力和叶片光合特性的影响

doi:10.3969/j.issn.1000-6362.2016.01.007

摘要/Abstract

摘要：

以上海崇明岛花椰菜品种“崇花120天”为试材，于2014年8-11月人工气候室开展盆栽试验，将花椰菜植株根部分别淹水处理3、6、9、12、15d，以正常灌溉为对照（CK），测定花椰菜的根系活力和叶片光合参数等指标。结果表明：(1)随着淹渍胁迫时间的延长，花椰菜的根系活力呈不同程度的降低。当淹渍胁迫超过9d后，根系活力趋于0；(2)与CK相比，淹渍胁迫3、6、9、12和15d时，叶片最大净光合速率分别下降4.90%、68.13%、78.71%、90.92%和98.68%，与此同时，光补偿点降低、光饱和点也随之增大；(3)淹渍胁迫下花椰菜气孔导度、蒸腾速率和胞间CO2浓度明显下降，淹渍胁迫初期，气孔限制值增大。说明胁迫初期影响花椰菜净光合速率下降的因素为气孔限制因子。(4)淹渍胁迫前6d各项指标下降明显，之后趋于稳定，可以确定淹渍胁迫第6天为致灾临界指标。

关键词: 根系活力, 气孔导度, 蒸腾速率, 气孔限制值

Abstract:

Took cauliflower variety of Chonghua as a material, the artificial environment control experiment was conducted in Nanjing University of Information Science and Technology from August to November in 2014. The waterlogging was treated as five levels: 3, 6, 9, 12, 15 days, took normal irrigation as control (CK)，the root activity and photosynthetic parameters of cauliflower were measured. The results showed that the root activity presented a declining trend with the increase of waterlogging days. When the experiment lasted for more than 9 days, the root activity tended to 0, when the experiment lasted for 3, 6, 9, 12 and 15 days, the maximum net photosynthetic rate decreased 4.90%, 68.13%, 78.71%, 90.92% and 98.68%, respectively, meanwhile, light compensation point decreased and light saturation point increased. Stomatal conductance, transpiration rate and intercellular CO2 concentration decreased significantly under waterlogging stress, but stomatal limitation increased at the beginning of the stress, that is stomatal limitation resulted in the decrease of net photosynthetic rate at early stress. The study confirmed that all indices declined obviously during the early 6 days and then tended to stabilization, so the 6th day was the critical indicator of Chonghua cauliflower.

Key words: Root activity, Stomatal conductance, Transpiration rate, Stomatal limitation value

侯奇奇，杨再强，史五一，袁雨晖，顾薇. 淹渍对花椰菜根系活力和叶片光合特性的影响[J]. 中国农业气象, 2016, 37(01): 51-58.

HOU Qi-qi, YANG Zai-qiang, SHI Wu-yi, YUAN Yu-hui, GU Wei. Effect of Waterlogging Stress on Root Activity and Leaf Photosynthesis Character of Cauliflower[J]. Chinese Journal of Agrometeorology, 2016, 37(01): 51-58.

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