CAJ | 학술논문

土壤水分胁迫下,抗旱性强的小麦品种昌乐5号、北农2号与抗旱性弱的济南13、鲁麦5号相比,渗透调节能力高0.41～0.60 MPa,相对含水量少降6.39～10.74个百分点,叶水势少降0.19～0.63 MPa.水分胁迫使小麦叶片光合能力下降,水分胁迫全过程下降平均百分数,抗旱性强的品种比抗旱性弱的品种光合速率少降17.7%～22.5%;气孔导度少降21.06%～23.75%.小麦叶肉细胞叶绿体的超微结构发生变化且随水分胁迫的加重而加剧,但变化程度与小麦的抗旱性及渗透调节能力成负相关.胁迫导致叶绿体外形变圆,类囊体肿胀,片层间距加大,基质片层模糊,最终叶绿体解体.
토양수분협박하,항한성강적소맥품충창악5호、북농2호여항한성약적제남13、로맥5호상비,삼투조절능력고0.41～0.60 MPa,상대함수량소강6.39～10.74개백분점,협수세소강0.19～0.63 MPa.수분협박사소맥협편광합능력하강,수분협박전과정하강평균백분수,항한성강적품충비항한성약적품충광합속솔소강17.7%～22.5%;기공도도소강21.06%～23.75%.소맥협육세포협록체적초미결구발생변화차수수분협박적가중이가극,단변화정도여소맥적항한성급삼투조절능력성부상관.협박도치협록체외형변원,류낭체종창,편층간거가대,기질편층모호,최종협록체해체.
Under soil water stress,osmotic adjustment ability of wheat cultivars with strong drought-resistant was 0.41MPa-0.60MPa stronger than that of wheat cultivars with weak drought-resistant.Dropping percentage of rilative water content and dropping value of water potential were 6.39-10.74 percentage point and 0.19MPa-0.63MPa less than that of weak drought resistant cultivars.Meanwhile,Photosynthetic capacity was inhibited under soil water stress.However,the degree of inhibition of photosynthetic rate and stomatal conductance of strong drought-resistant cultivars were 17.7%-22.5% and 21.06%-23.75% less than that of weak drought-resistant cultivars,respectively.Ultrastructure changes of wheat mesophyll cell chloroplast of 2 cultivars were examined under soil water stress.The more severe the soil water stress was,the greater the changes of chloroplast ultrastructure were.The changes were negative correlation with cultivars'drought-resistant and osmotic adjustment ability.The morphology of chloroplast under soil water stress changed into circlar.Thylakoid of chloroplast became swollen,matrix lamella became obscure,ultimately,the chloroplast were disintegrated.