CAJ | 학술논문

盆载条件下对4个不同基因型小麦品种于播种前以外源激素PDJ(10 mg·L~(-1))浸种处理和返青期始干旱胁迫,测定其光合特性、水分利用和化感抗草差异.结果表明:水分胁迫(田间持水量的45%)和PDJ处理均能增强几种供试小麦的化感抗草诱导效应,两者均通过降低杂草生物量从而抑制杂草生长.水分胁迫和PDJ处理均能增强"兰考95-25"、"小偃6号"拔节期的叶片光合速率,降低气孔限制值和提高水分利用率;"豫麦66"PDJ处理下可增强光合作用而降低水分利用率,但干旱胁迫下则相反;"兰考217"经PDJ处理光合速率和水分利用率均降低.典范对应分析发现供试小麦受到干旱胁迫和外源激素PDJ处理后会引起植物形态和光合生理的变化,从而影响其化感抗草特性.小麦整体化感潜势与以杂草生物量(杂草鲜重/盆)表示的抗草指标显著相关,而小麦的整体抗草特性主要与其水分利用率、光合速率和蒸腾速率显著正相关,与植物地上生物量、株高、节间距离和气孔导度显著负相关.
분재조건하대4개불동기인형소맥품충우파충전이외원격소PDJ(10 mg·L~(-1))침충처리화반청기시간한협박,측정기광합특성、수분이용화화감항초차이.결과표명:수분협박(전간지수량적45%)화PDJ처리균능증강궤충공시소맥적화감항초유도효응,량자균통과강저잡초생물량종이억제잡초생장.수분협박화PDJ처리균능증강"란고95-25"、"소언6호"발절기적협편광합속솔,강저기공한제치화제고수분이용솔;"예맥66"PDJ처리하가증강광합작용이강저수분이용솔,단간한협박하칙상반;"란고217"경PDJ처리광합속솔화수분이용솔균강저.전범대응분석발현공시소맥수도간한협박화외원격소PDJ처리후회인기식물형태화광합생리적변화,종이영향기화감항초특성.소맥정체화감잠세여이잡초생물량(잡초선중/분)표시적항초지표현저상관,이소맥적정체항초특성주요여기수분이용솔、광합속솔화증등속솔현저정상관,여식물지상생물량、주고、절간거리화기공도도현저부상관.
In a pot experiment, growth adaptation of four winter wheat (Triticum aestivum L.) accessions was investigated following seed pretreatment by soaking with prohydrojasmon (a kind of exogenous hormone at 10 mg · L~(-1)) before sowing. The seeds were subjected to artificial soil water regulation at 75% and 45% field capacity at the start of greening. Also in the experiment, the photosynthesis level, water use, variation of weed-controlling effect of allelopathy of wheat under acclimatized soil water and PDJ treatment was conducted. Soil drought and PDJ were used to stimulate the overall allelopathic inhibition and weed-resistance of wheat in the pot trial. The study shows that physiological response of "Lankao 95-25" and "Xiaoyan 6" to water shortage and PDJ is significant due to enhanced leaf net photosynthetic rate, water use efficiency and stoma capacity. Under PDJ, photosynthetic rate of "Yumai 66" obviously increases. However, water use efficiency decreases, while drought stress has just the opposite effect on "Yumai 66". Under PDJ treatment, leaf net photosynthetic rate and water use efficiency of "Lankao 217" decrease. Based on Canonical Correspondence Analysis (CVA), water deficit and PDJ change the phenotype and photosynthetic physiology of plants, consequently influencing weed-controlling effect of allelopathy. On the average, allelopathic potential in intact wheat plants has a significant correla-tion with wheat weed-resistance expressed with weed biomass. Wheat weed-resistance characteristics are significantly directly related with wheat photosynthetic rate, transpiration rate and water use efficiency. However, they are significantly inversely related with aboveground biomass, plant height, node distance and stoma conductance.