CAJ | 학술논문

以祁连圆柏Sabina przewalskii和圆柏Sabina chinensis为材料,研究了圆柏属植物的抗冷冻性与针叶δ~(13)C值季节变化的关系.结果表明,两种圆柏属植物的δ~(13)C值均随温度的降低而减小并在整个冬季维持较低水平.表明圆柏属植物为了抵抗低温的伤害,加强了自身能量物质的消耗,即呼吸作用增强,导致植物体内的δ值偏向更负.在整个测定期中,祁连圆柏的δ~(13)C值都显著高于圆柏的δ~(13)C值,表明在低温胁迫过程中,圆柏为适应低温、提高其抗冷冻能力所消耗自身能量物质的量远高于祁连圆柏.这与祁连圆柏具有较强的抗冷冻适应性策略一致.此外,两种圆柏属植物碳同位素组成与月均温度表现出极显著的线性相关性,并且与脯氨酸(Pro)质量分数、针叶相对含水量(RWC)也都表现出极显著的线性相关性.因此,碳同位素组成可以作为鉴定圆柏属植物抗冷冻性的又一重要指标.
이기련원백Sabina przewalskii화원백Sabina chinensis위재료,연구료원백속식물적항냉동성여침협δ~(13)C치계절변화적관계.결과표명,량충원백속식물적δ~(13)C치균수온도적강저이감소병재정개동계유지교저수평.표명원백속식물위료저항저온적상해,가강료자신능량물질적소모,즉호흡작용증강,도치식물체내적δ치편향경부.재정개측정기중,기련원백적δ~(13)C치도현저고우원백적δ~(13)C치,표명재저온협박과정중,원백위괄응저온、제고기항냉동능력소소모자신능량물질적량원고우기련원백.저여기련원백구유교강적항냉동괄응성책략일치.차외,량충원백속식물탄동위소조성여월균온도표현출겁현저적선성상관성,병차여포안산(Pro)질량분수、침협상대함수량(RWC)야도표현출겁현저적선성상관성.인차,탄동위소조성가이작위감정원백속식물항냉동성적우일중요지표.
Seasonal changes of δ~(13)C values were examined in the needles of Sabina przewalskii and Sabina chinensis, aimed to probe into their relationships with freezing tolerance. The results showed that the δ~(13)C values in needles of the two species declined with monthly average temperature decreasing and maintained a relatively lower value during the whole winter. It indicated that the two species consumed more self substances in order to adapt to low temperature. As a result, the δ~(13)C values decreased. The δ~(13)C values of S. przewalskii were significantly higher than those of S. chinensis, it suggested that S. chinensis must consume more self substances than S. przewalskii under low-temperature stress. S. przewalskii showed a more prevailing strategy than S. chinensis in order to develop the tolerance to freezing. Furthermore, strong significant linear relationships were observed between δ~(13)C value and monthly average temperature, between δ~(13)C value and Pro content, and between δ~(13)C value and RWC in needles of S. przewalskii and S. chinensis. These results suggested that the δ13C values in the needles can be used as another index to evaluate freezing tolerance of Sabina.