Dinler Burcu Seckin, Demir Emel, Kompe Yasemin Ozdener
Sinop University Faculty of Arts and Sciences, Biology Sinop Turkey.
The Black Sea Agriculture Resources Institute Samsun Turkey.
Acta Biol Hung. 2014 Dec;65(4):469-80. doi: 10.1556/ABiol.65.2014.4.10.
In the present study, the effect of ascorbic acid (5 mM) on some physiological parameters and three hormones (auxin, abscisic acid, salicylic acid) was determined under heat stress (40 °C) in maize tolerant cv. (MAY 69) and sensitive cv. SHEMAL (SH) at 0 h, 4 h and 8 h. Heat stress reduced total chlorophyll content (CHL), relative water content (RWC) and stomatal conductance (gs) in SH but did not lead to changes in MAY 69 at 4 h and 8 h. However, pretreatment with ascorbic acid increased (CHL), (RWC) and (gs) in SH under heat stress while it reduced MDA content significantly in both cv. We also observed that heat stress led to a reduction in SA level but increased ABA and IAA levels in SH, whereas it increased SA and IAA levels but did not change ABA level in MAY 69 at 4 h. Furthermore, in SH, ASC application under heat stress increased SA level and decreased IAA and ABA levels at 4 h, but it had no effect on SA and ABA at 8 h.
在本研究中，测定了抗坏血酸（5 mM）对玉米耐热品种（MAY 69）和敏感品种SHEMAL（SH）在热胁迫（40°C）下0小时、4小时和8小时时一些生理参数以及三种激素（生长素、脱落酸、水杨酸）的影响。热胁迫降低了SH中的总叶绿素含量（CHL）、相对含水量（RWC）和气孔导度（gs），但在4小时和8小时时MAY 69未发生变化。然而，抗坏血酸预处理在热胁迫下提高了SH中的（CHL）、（RWC）和（gs），同时显著降低了两个品种中的丙二醛含量。我们还观察到，热胁迫导致SH中的水杨酸水平降低，但脱落酸和生长素水平升高，而在4小时时MAY 69中的水杨酸和生长素水平升高，但脱落酸水平未发生变化。此外，在SH中，热胁迫下施用抗坏血酸在4小时时提高了水杨酸水平，降低了生长素和脱落酸水平，但在8小时时对水杨酸和脱落酸没有影响。
