山西农业大学学报（自然科学版）2019，Vol.39Issue(6)：1-7,7.DOI:10.13842／j.cnki.issn1671‐8151 .201901007
遮光强度对小麦叶片光合特性及生理代谢特征的影响
Shading intensity impact the photosynthetic rate and physiological metabolism of wheat
摘要
Abstract
This study aimed to explore the effects of shading intensity on the photosynthetic and physiological metabolic features of w heat .[M ethods] The field trials were conducted for three successive years .T hree shading intensity levels were set up ,including light shading (S1 ,single layer shading with photosynthetically active ra‐diation decreased by 20%) ,moderate shading (S2 ,double layers shading with photosynthetically active radiation de‐creased by 40%) , and heavy shading (S3 , triple layers shading , photosynthetically active radiation decreased by 60%).Natural light source without shading was served as control (CK ).[Results ] Soil moisture content and light transmittance were decreased with the increase of shading intensity level ,and the highest value was observed in CK group followed by S1 ,S2 ,and S3 in that order with the significantly difference from each other (P＜0 .05).How ever , no significant difference was detected in term of surface temperature in all treatments (P＞0 .05).Under the condition of no shading intensity (CK ) ,the diurnal variation in the rate of photosynthesis presented a gradually increasing curve , and the same trend w as found in all three shading treatments .Stomatal conductance ,photosynthetic rate ,and intercel‐lular CO2 concentration were gradually decreased with the increase of shading intensity ,and the difference between dif‐ferent treatments was significant (P＜0 .05).T ranspiration rate was steadily reduced with the increase of shading in‐tensity ,but no significant difference was observed between different treatments (P＞0 .05).Leaf thickness ,leaf area , leaf area index ,specific leaf w eight ,leaf relative moisture content ,chlorophyll a ,chlorophyll b ,and carotenoids in the leaves were all gradually decreased with the increase of shading intensity .[Conclusion] Shading treatment significantly This study aimed to explore the effects of shading intensity on the photosynthetic and physiological metabolic features of w heat .[M ethods] The field trials were conducted for three successive years .T hree shading intensity levels were set up ,including light shading (S1 ,single layer shading with photosynthetically active ra‐diation decreased by 20%) ,moderate shading (S2 ,double layers shading with photosynthetically active radiation de‐creased by 40%) , and heavy shading (S3 , triple layers shading , photosynthetically active radiation decreased by 60%).Natural light source without shading was served as control (CK ).[Results ] Soil moisture content and light transmittance were decreased with the increase of shading intensity level ,and the highest value was observed in CK group followed by S1 ,S2 ,and S3 in that order with the significantly difference from each other (P＜0 .05).How ever , no significant difference was detected in term of surface temperature in all treatments (P＞0 .05).Under the condition of no shading intensity (CK ) ,the diurnal variation in the rate of photosynthesis presented a gradually increasing curve , and the same trend w as found in all three shading treatments .Stomatal conductance ,photosynthetic rate ,and intercel‐lular CO2 concentration were gradually decreased with the increase of shading intensity ,and the difference between dif‐ferent treatments was significant (P＜0 .05).T ranspiration rate was steadily reduced with the increase of shading in‐tensity ,but no significant difference was observed between different treatments (P＞0 .05).Leaf thickness ,leaf area , leaf area index ,specific leaf w eight ,leaf relative moisture content ,chlorophyll a ,chlorophyll b ,and carotenoids in the leaves were all gradually decreased with the increase of shading intensity .[Conclusion] Shading treatment significantly inhibited the synthesis of chlorophyll and reduced the rate of photosynthesis ,w hile transpiration impact was not signif‐icantly impacted.T he three main factors that influence the photosynthetic characteristics were photosynthetic effective radiation ,photosynthetic rate ,and chlorophyllb content .关键词
遮光强度/光合特性/生理代谢特征/小麦Key words
Shading intensity/Photosynthetic characteristic/Physiological metabolism traits/Wheat分类
农业科技引用本文复制引用
李常英,张金凤,丁美丽,王裕..遮光强度对小麦叶片光合特性及生理代谢特征的影响[J].山西农业大学学报（自然科学版）,2019,39(6):1-7,7.基金项目
山东省科技厅山东省科技发展计划课题(2014GNC110030) （2014GNC110030）
