CAJ | 학술논문

旨为分析不同西瓜品种在发芽期的耐冷特性、苗期的生长特性、光合作用及生理生化方面的差异,筛选出西瓜耐冷性的综合鉴定指标和鉴定方法,为实际生产上选育耐冷性的西瓜种质资源提供依据。通过对12份西瓜材料进行耐冷性比较,初步筛选出3个耐冷性不同的西瓜材料,对这3个材料进行低温处理。结果表明：不同处理时间下,各品种的冷害指数有差异。通过测定处理6d和8d时的冷害指数,得出各品种耐低温性强弱,从中选出耐低温性品种红野一号、中等耐低温性品种抗病苏蜜和冷敏感品种橙兰。15℃低温条件下,耐冷性品种红野一号的发芽率、相对发芽率、胚根长及相对胚根长最高。15℃可作为西瓜种子发芽期耐低温性鉴定的适宜温度；种子的始发芽日期、相对发芽率、相对胚根长可作为西瓜芽期耐低温鉴定指标。三叶一心的西瓜幼苗低温处理后,植株的生长量降低,光合速率下降,植株叶片的酶活性增加,MDA含量上升,各指标的变化幅度与低温处理强度及品种自身耐冷性相关。得出植株的株高、叶面积、株鲜质量、根干质量、净光合速率( Pn)、Chl a/b比值、MDA含量的变化幅度可作为西瓜耐低温品种筛选的鉴定指标。
지위분석불동서과품충재발아기적내랭특성、묘기적생장특성、광합작용급생리생화방면적차이,사선출서과내랭성적종합감정지표화감정방법,위실제생산상선육내랭성적서과충질자원제공의거。통과대12빈서과재료진행내랭성비교,초보사선출3개내랭성불동적서과재료,대저3개재료진행저온처리。결과표명：불동처리시간하,각품충적냉해지수유차이。통과측정처리6d화8d시적냉해지수,득출각품충내저온성강약,종중선출내저온성품충홍야일호、중등내저온성품충항병소밀화랭민감품충등란。15℃저온조건하,내랭성품충홍야일호적발아솔、상대발아솔、배근장급상대배근장최고。15℃가작위서과충자발아기내저온성감정적괄의온도；충자적시발아일기、상대발아솔、상대배근장가작위서과아기내저온감정지표。삼협일심적서과유묘저온처리후,식주적생장량강저,광합속솔하강,식주협편적매활성증가,MDA함량상승,각지표적변화폭도여저온처리강도급품충자신내랭성상관。득출식주적주고、협면적、주선질량、근간질량、정광합속솔( Pn)、Chl a/b비치、MDA함량적변화폭도가작위서과내저온품충사선적감정지표。
12 different genotypes of watermelon seedings were studied in low temperature stress treatment,and selected three different cold tolerant watermelon materials. The cold tolerance of 3 watermelon materials seeds during the germination were analyzed with five different temperature, study of low temperature,weak light resistance in wa-termelon seedings and the change of growth characteristic,photosynthesis and physiological and biochemical charac-teristics under low temperature, to develop an efficient, comprehensive appraisal index and evaluation method for cold-resistance watermelon,the purpose of this study was to provide theoretical basis for the actual production breed-ing for low temperature,weak light watermelon germplasm resources. The results showed that the chilling injury in-dex of each genotype was different under different processing time. It is concluded that each type of cold resistance strength through the determination of chilling injury index in 6 and 8 days treatment,and choose Hongyeyihao as cold tolerant germplasm,moderately cold resistance varieties gerplasm Kangbingsumi and cold sensitive germplasm Chenglan. Under 15 ℃,Hongyeyihao germination rate,relative germination rate,length of radicle and relative radi-cle were the highest,15℃ can be used as a watermelon seed germination period of low temperature resistance iden-tification of appropriate temperature;Date of the beginning of seed germination and relative germination rate,relative radicle length can be used as a watermelon bud good low temperature resistance appraisal indicators. After low temper-ature treatment,plant growth,photosynthetic rate decreased,the enzyme activity of leaves increased,MDA content in-creased,the change range of each index associated with varieties of low temperature treatment intensity and its cold re-sistance. Plant height, leaf area, plant fresh weight, root dry weight, the leaf net photosynthetic rate ( Pn ) , Chl a/b ratio,MDA content as watermelon varieties of resistance to low temperature screening appraisal indicators.