CAJ | 학술논문

为研究盐胁迫对不同基因型木薯幼苗叶绿素含量及光合特性的影响,本研究采用水培法对4个木薯品种进行盐胁迫,利用SPAD-502测定胁迫5 d内叶片相对叶绿素含量,LCpro-SD光合仪测定光合特性参数。结果显示：10 g/L NaCl胁迫降低了4个木薯品种叶片中相对叶绿素含量、净光合速率、气孔导度、蒸腾速率,且均在胁迫5 d时达到最低值；胞间CO2浓度均呈先下降后上升的趋势,在胁迫5 d时达到最大值。由光合特性参数的变化得出随着盐胁迫时间的延长,光合速率下降的原因逐渐由气孔限制转向非气孔限制,叶绿素含量及光合特性参数的变化与木薯基因型抗性密切相关。
위연구염협박대불동기인형목서유묘협록소함량급광합특성적영향,본연구채용수배법대4개목서품충진행염협박,이용SPAD-502측정협박5 d내협편상대협록소함량,LCpro-SD광합의측정광합특성삼수。결과현시：10 g/L NaCl협박강저료4개목서품충협편중상대협록소함량、정광합속솔、기공도도、증등속솔,차균재협박5 d시체도최저치；포간CO2농도균정선하강후상승적추세,재협박5 d시체도최대치。유광합특성삼수적변화득출수착염협박시간적연장,광합속솔하강적원인축점유기공한제전향비기공한제,협록소함량급광합특성삼수적변화여목서기인형항성밀절상관。
To study the effect of severe salt stress on chlorophyll content and photosynthetic characteristics of cassava seedlings, four kinds of cassava seedlings were treated with NaCl solution, and the relative chlorophyll contents of leaves and photosynthetic parameters were measured. The results showed that relative chlorophyll contents, net photosynthetic rates, stomatal conductances, transpiration rates of four kinds of cassava subjected to 10 g/L NaCl stress were decreased and reached the lowest on day 5 of salt stress. Intercellular CO2 concentration showed an upward trend following initial de-cline, and reached the maximum on day 5 of salt stress. Stomatal limitation was replaced by non-stomatal limitation as a leading cause for decreased photosynthetic rate over the time of salt stress. Chlorophyll content and photosynthetic parame-ters were closely related to salt tolerance of cassava genotypes.