温度对茄子单性结实子房(果实)发育过程中内源激素含量的影响

Effect of Temperature on Endogenous Hormones Contents during Parthenocarpic Eggplant Ovary (Fruit) Development

以茄子单性结实品系D-10、D-21和非单性结实品系03-2为试材,研究了自然低温对茄子子房(果实)发育过程中4种内源激素,即生长素(IAA)、赤霉素(GA4)、玉米素核苷(ZR)和脱落酸(ABA)含量的影响及其与果实生长发育的关系。结果表明:不同温度下茄子果实发育过程中内源IAA、ZR和ABA含量的变化趋势基本相同,均是在开花初期逐渐上升,并达到一个峰值,之后急剧下降,且子房(果实)发育前期的IAA、ZR和ABA含量均明显高于果实发育后期的IAA、ZR和ABA含量。日平均最低温度为14.3℃显著降低了果实发育后期(开花6 d后)茄子不同品系的IAA水平,但对果实发育前期IAA含量的影响因基因型不同而异,可明显降低03-2开花初期IAA的合成。不同基因型茄子果实发育过程中GA4含量对温度的响应无明显规律。温度对ZR和ABA含量的影响主要表现在果实发育初期,日平均最低温度为14.3℃不利于开花时ZR的合成,但显著提高了D-10的ABA含量。茄子果实发育初期较高的IAA和ABA水平有利于果实发育和单性结实,而GA4和ZR可能与单性结实关系不大。

In order to investigate the effects of natural low temperature on 4 kinds of endogenous hormones(IAA,GA4,ZR,ABA)contents during parthenocarpic eggplant(Solanum melongena L.)ovary(fruit)development,and the relationship between endogenous hormones and eggplant fruit development,the parthenocarpic line D-10,D-21 and non-parthenocarpic line 03-2 were examined at different temperature conditions.The results showed that the changing trend of IAA,ZR and ABA contents during fruit development were similar among different temperature conditions.IAA,ZR and ABA contents were higher in the early stage of fruit development than that in the later stage of fruit development.Low temperature could significantly decrease IAA content at later stage of fruit devel-opment.But its effect on the IAA content at early stage of fruit development was varied with differ-In order to investigate the effects of natural low temperature on 4 kinds of endogenous hormones(IAA,GA4,ZR,ABA)contents during parthenocarpic eggplant(Solanum melongena L.)ovary(fruit)development,and the relationship between endogenous hormones and eggplant fruit development,the parthenocarpic line D-10,D-21 and non-parthenocarpic line 03-2 were examined at different temperature conditions.The results showed that the changing trend of IAA,ZR and ABA contents during fruit development were similar among different temperature conditions.IAA,ZR and ABA contents were higher in the early stage of fruit development than that in the later stage of fruit development.Low temperature could significantly decrease IAA content at later stage of fruit devel-opment.But its effect on the IAA content at early stage of fruit development was varied with differ-ent genotypes.Low temperature could significantly decrease IAA content of non-parthenocarpic line 03-2 at the early flowering stage,which indicated that low temperature went against IAA synthesis of non-parthenocarpic line 03-2.No evident regularity was found in the effect of temperature on GA4 contents in fruit development of different genotypes.The effects of temperature on ZR and ABA con-tents were occurred at early stage of fruit development.In the flowering stage,when the daily mini-mum temperature was 14.3 ℃,ZR synthesis was blocked,whereas ABA content was increased significantly.Higher IAA and ABA levels at early stage of fruit development were beneficial to egg-plant fruit development and parthenocarpy.However,GA4 and ZR may have no relation to eggplant parthenocarpy.