Study On The Photosynthetic Characteristics Of Liangshan Introduced Olive(Olea Europaea L.) Cultivars

In order to explore Olea europaea L. adaptability to the Xichang environment factors and climatic conditions, in April (dry season) and August (rainy season) GFS-3000 portable photosynthesis system was used to measured the photosynthetic parameters Of 6 O. europaea cultivars:Barnea, Arbosana, Tanche, Manzanillo, Picual? Pendolino. Specific leaf weight, chlorophyll content, yield, oil content, anatomical structures were measured at the same time. The main results are as follows:1.The one-peak curve of net photosynthetic rate diurnalvariation was observed in dry season and rainy season.According the correlation analysis, transpiration rate (correlation coefficient 0.963) was the key factor to net photosynthetic rate in dry season and stomatal conductance (correlation coefficient 0.991) was the key factor to net photosynthetic rate in rainy season.2. By analyzing the diurnal variation and photosynthetic light response curve, the average value of net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, water use efficiency, light use efficiency was higher in dry season than rainy season; The average value of transpiration rate was similar in the two season. Thus compared with rainy season, O. europaea showed stronger tolerance to drought stress, higher use efficiency of water and light.3. In dry season, the light compensation point of O. europaea was within 18.42? 36.97 ?mol·m-2·s-1;the light saturation point of O. europaea was within 539.48?954.42 ?mol·m-2·s-1. In rainy season, the light compensation point of O. europaea was within 24.05?57.07 ?mol·m-2·s-1?the light saturation point of O. europaea was within 476.31? 768.51 ?mol·m-2·s-1. From dry season to rainy season, the light compensation point decreased, the light saturation point increased, O. europaea showed a more narrow light adaptation scope.4. From dry season to rainy season, O. europaea specific leaf weight, chlorophyll a, chlorophyll b, chlorophyll a+b showed a down trend. The specific leaf weight, chlorophyll a, chlorophyll b, chlorophyll a+b was significant positive correlated with net photosynthetic rate, the value of three factors can reflect the photosynthetic ability under some conditions.5. Net photosynthetic rate, light use efficiency, light saturation point of Barnea, Arbosana and Tanche was higher than the other 3 cultivars; the light compensation point of Barnea, Arbosana and Tanche was lower than the other 3 cultivars; the Barnea Arbosana and Tanche showed stronger photosynthetic ability and wider light adaptation scope. The water use efficiency of Tanche was higher than the other cultivars, stronger tolerance to drought stress.6. O. europaea through thicker cuticle, against strong light and high temperature damage, reduced water loss; thicker upper epidermis, more water stored; developed palisade tissue, increased photosynthetic ability and water use efficiency. The palisade tissue thickness, palisade/spongy, tissue structure tense ratio was significant positive correlated with net photosynthetic rate, the value of three factors can reflect the photosynthetic ability under some conditions. The net photosynthetic rate was significant positive correlated with yield, correlation coefficient 0.757;the net photosynthetic rate positive correlated with oil content, but not significant. The net photosynthetic rate can reflect the yield under some conditions.