CAJ | 학술논문

通过盆栽试验，以抗旱性强弱不同的两个种源地文冠果为试验材料，对干旱胁迫下文冠果的光合生理指标进行较为系统的研究，结果表明：①干旱胁迫条件下两个种源地文冠果叶片净光合速率（Pn）、气孔导度（Cond）、蒸腾速率（Tr）、叶绿素含量（Chl）都有不同幅度的下降。抗旱性强的文冠果（新疆喀什）随着干旱胁迫的加剧，净光合速率、气孔导度和叶绿素含量下降较慢。②轻度干旱胁迫下气孔限制是影响两个种源地文冠果 Pn下降的主要因素；中度和重度干旱胁迫下，非气孔限制是两个种源地文冠果 Pn下降的主要因素。③叶绿素荧光参数研究表明：干旱胁迫条件下两个种源地文冠果PSⅡ反应中心光化学效率（Fv/Fm ）、PSⅡ潜在活性（Fv/Fo ）均降低；PSⅡ光化学淬灭系数（qP）均降低，而PSⅡ非光化学淬灭系数（qNP）则增大。总体上，与抗旱性弱的文冠果相比，抗旱性强的文冠果的 Fv/Fm和Fv/Fo下降幅度较小，PSⅡ的光化学能力和PSⅡ潜在活性均较强；PSⅡ光化学淬灭系数（qP）降低的幅度较小且PSⅡ非光化学淬灭系数（qNP）降低幅度较大。
통과분재시험，이항한성강약불동적량개충원지문관과위시험재료，대간한협박하문관과적광합생리지표진행교위계통적연구，결과표명：①간한협박조건하량개충원지문관과협편정광합속솔（Pn）、기공도도（Cond）、증등속솔（Tr）、협록소함량（Chl）도유불동폭도적하강。항한성강적문관과（신강객십）수착간한협박적가극，정광합속솔、기공도도화협록소함량하강교만。②경도간한협박하기공한제시영향량개충원지문관과 Pn하강적주요인소；중도화중도간한협박하，비기공한제시량개충원지문관과 Pn하강적주요인소。③협록소형광삼수연구표명：간한협박조건하량개충원지문관과PSⅡ반응중심광화학효솔（Fv/Fm ）、PSⅡ잠재활성（Fv/Fo ）균강저；PSⅡ광화학쉬멸계수（qP）균강저，이PSⅡ비광화학쉬멸계수（qNP）칙증대。총체상，여항한성약적문관과상비，항한성강적문관과적 Fv/Fm화Fv/Fo하강폭도교소，PSⅡ적광화학능력화PSⅡ잠재활성균교강；PSⅡ광화학쉬멸계수（qP）강저적폭도교소차PSⅡ비광화학쉬멸계수（qNP）강저폭도교대。
A pot-cultivation experiment was performed to investigate the photosynthetic physiology of X .sorbifolia under the drought stress .Two varieties of X .sorbifolia from different provenances were used to systematically study the phtotosynthetic physiology under the drought stress .The results showed that:(1)Under the drought stress,the net pho-tosynthetic rate,stomatal conductance,transpiration rate and chlorophyll content decreased in varying degrees both in the leaves of X .sorbifolia Compared to X .sorbifolia from Yan′an,Shaanxi with the low drought-resistance,the net photo-synthetic rate,stomatal conductance,transpiration rate and chlorophyll content decreased more slowly .In the leaves of X .sorbifolia from Kaishi,Xinjiang with high drought-resistance .(2)Under the light drought stress,stomatal restriction was the main factor for the Pn’s decreased in the leaves of both the two varieties of X.sorbifolia,while the non-stomatal restriction was the main factor for the Pn’decrease under the medium and severe drought stress.(3)The result of fluo-rescence experiment of PSⅡ Reaction Center indicated Fv/Fm and Fv/Fo decreased in both X .sorbifolia under the drought stress,the quenching of chlorophyll fluorescence (qP)decreased,and non-photochemical quenching of chloro-phyll fluorescence(qNP)increased for both X .sorbifolia under the drought stress .In general,compared to X .sorbifolia with the low drought-resistance,Fv/Fm and Fv/Fo had a smaller decrease,qP had a smaller decrease and qNP had a bigger increase in the leaves of X .sorbifolia under the drought stress .