초록
<P><B>Abstract</B></P> <P>Changes in volatile compounds, the ratio of six-carbon (C6) to nine-carbon (C9) aldehydes, the ratio of linoleic acid to linolenic acid and <I>CsLOX</I> gene expression patterns were investigated in cucumber fruits of two different inbred lines after storage at 25 °C or 4 °C. The content of total volatile compounds in both lines was lower and the peak was later for the fruit stored at 4 °C than for that stored at 25 °C, whereas C6 was produced more rapidly than C9 at both temperatures and in both lines. The amount of linoleic acid cleaved at 4 °C was greater than that cleaved at 25 °C, and (E, Z)-2,6-nonadienal/(E)-2-nonenal content was higher at 25 °C than at 4 °C in both lines. There were different expression patterns for cucumber <I>CsLOX</I> genes at the two storage temperatures in the different lines. Principal component analysis showed that the 9-type <I>CsLOX02</I> was closely related to the formation of C9 aldehydes and the 13-type <I>CsLOX16</I>, <I>CsLOX17</I>, <I>CsLOX19</I>, and <I>CsLOX20</I> were closely related to formation of C6 aldehydes. Therefore, the expression of <I>CsLOXs</I> might be responsible for differences in the production of volatile compounds at the different storage temperatures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lower content of total volatile compounds was found in 4 °C than 25 °C in both lines. </LI> <LI> C6 was produced more rapidly than that of C9 in both temperatures and both lines. </LI> <LI> More linoleic acid was cleaved in 4 °C than 25 °C in both lines. </LI> <LI> Different CsLOXs gene expression patterns were shown. </LI> <LI> Different type CsLOXs were closely related to different type aldehydes formation. </LI> </UL> </P>