| 摘要: |
| 为明确薏苡品种的光合特性及与氮素利用效率间的关系。2015年早季和晚季，分别以从大田试验中筛选出来的氮素利用效率较高和较低品种各2个为材料进行盆栽试验，在分蘖期、抽穗期和成熟期测定功能叶片光合速率及叶绿素荧光参数，抽穗期测定顶部4片功能叶的光合速率，成熟期测定氮素积累量和氮素利用效率。结果表明，氮高效品种西林1号（XL）与黔饮1号（QL）早季和晚季成熟期单株氮素吸收量平均分别比氮低效品种隆林1号（LL）与品种10号（CU）高125.5%和96.0%，其氮素利用效率平均比品种LL与CU分别高出17.7%和18.0%，品种间差异显著。氮高效品种在分蘖期、抽穗期和成熟期功能叶片的光合速率和叶绿素含量均明显高于氮低效品种。同时，氮高效品种在分蘖期后的光合速率、叶绿素含量衰减速率比氮低效品种小。不同品种在分蘖期、抽穗期和成熟期功能叶片的叶绿素荧光参数及抽穗期顶部4片功能叶光合速率也存在一定的差异，但品种间的变化规律不明显。综上所述，氮高效薏苡品种各生育期功能叶片的光合速率和叶绿素含量较高，其中后期光合速率及叶绿素含量衰减较慢。薏苡品种氮素利用效率与功能叶片的叶绿素荧光参数及顶部4片功能叶光合速率的变化没有显著的相关关系。 |
| 关键词: 薏苡 氮素利用率 光合特性 光合速率 叶绿素含量 叶绿素荧光 |
| DOI：10.11841/j.issn.1007-4333.2018.11.03 |
| 投稿时间：2017-11-16 |
| 基金项目:广西八桂学者专项（桂人才通字（2011）4号） |
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| Photosynthetic characteristics and its relationship with nitrogen utilization efficiency of different coix cultivars |
|
Nghiem Tien Chung1,2, JIANG Ligeng1, KONG Feiyang1, Bui Thi Anh3
|
| (1.Agriculture College of Guangxi University, Nanning 530004, China;2.National Institute of Medicinal Materials, Ha Noi 10000, Vietnam;3.Son La College, Son La 27000, Vietnam) |
| Abstract: |
| This study explored the relationship between leaf photosynthetic characteristics and nitrogen use efficiency (NUE) of Coix cultivars. In early and late seasons of 2015, two pot experiments were conducted with four Coix cultivars with high NUE (XL and QY) and low NUE (LL and CU). Data were collected at tillering, heading and maturity stages to assess the relationship between leaf photosynthetic rate and chlorophyll fluorescence attribute. The photosynthetic rate and NUE of functional leaves (specify the leaf e.g. upper fully expanded leaf) were determined at heading stage. The results showed that the nitrogen uptake of high NUE cultivar LL and QL in the early and late seasons were respectively 125.5% and 96.0% higher by than those in low NUE cultivar XL and CU. Compared with LL and CU cultivars, the NUE on average of XL and QL were respectively 7.7% and 18.0% higher. The leaf photosynthetic rate and chlorophyll content of the high NUE cultivar were significantly higher than those of the low NUE variety at tillering, heading and maturity stage. At the same time, the photosynthetic rate and chlorophyll content of the high NUE cultivars were lower than those of nitrogen inefficient varieties after tillering stage. The chlorophyll fluorescence parameters and the photosynthetic rate of functional leaves at the full tillering, heading and maturity stages were not similar, but the variation pattern was not obvious. The photosynthetic rate and chlorophyll content of the functional leaves of the high-yielding cultivars were greater in the early growth stages but decreased later in the season. No significant relationship was observed between NUE and the chlorophyll fluorescence parameters and the change in photosynthetic rate of four functional leaves. |
| Key words: coix nitrogen utilization efficiency photosynthetic rate chlorophyll fluorescence |
