Volatile components of conventional and hybrid rice leaves were analysed by solid phase microextraction (SPME) and gas chromatographymass spectrometry(GCMS) with two conventional rice varieties(Allelopathic rice 3, Xiangyaxiangzhan) and two hybrid rice combinations (Ruanhuayou 3, Nongzhenyou 3) as materials during four developmental stages. The results showed that 41 and 37 components were identified in Allelopathic rice 3 and Xiangyaxiangzhan; 49 and 53 in Ruanhuayou 3 and Nongzhenyou 3. For Allelopathic rice 3, Xiangyaxiangzhan and Ruanhuayou 3, the number of volatile components maximized during milkripe stage, while for Nongzhenyou 3 during fullripe stage. There were some insignificant differences in volatile components and their relative content between conventional rice and hybrid rice combination during the same stage. The relative content of alkanes and terpenes decreased with rice ripening in the four tested rice. Longifolene and Squalene were identified in all tested rice during different stages. (Z)3Hexenol from Ruanhuayou 3 in flowering stage and γCaprolactone from Xiangyaxiangzhan and Nongzhenyou 3 in fullripe stage were identified, these two components were green leaf volatiles.The relationship between these components and rice quality, pests was worth of further study.
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