盐胁迫对枸杞枝条基质茄子幼苗生长及气体交换参数的影响

Effects of Salt Stress on Growth and Gas Exchange Parameters of Eggplant Seedlings in Caragana korshinskii Substrate

以茄子幼苗为试材,以自配枸杞枝条粉发酵基质为基质,对“斯卡特”长茄幼苗农艺性状和生理指标进行比较,研究了盐分胁迫对基于自配枸杞枝条粉发酵基质的茄子幼苗的影响,以期为西北地区枸杞枝条基质微咸水灌溉育苗提供参考依据。结果表明:茄子幼苗在0.1mol·L^(-1)NaCl处理下株高、茎粗均是最低,分别是5.8705cm、1.2608mm,比CK低38.36%、37.87%。盐胁迫对茄子幼苗的干物质量积累有明显的抑制作用,随盐溶液浓度的升高,幼苗干物质量分别比CK降低17.34%、37.93%、72.22%、37.93%。随盐溶液浓度升高,幼苗壮苗指数逐渐降低,比CK分别降低了11.51%、17.76%、28.60%、56.33%。幼苗根系受到盐胁迫后对根长无明显抑制作用,严重抑制根系活力。幼苗叶绿素含量随盐溶液浓度升高而降低,在0.1mol·L^(-1)NaCl处理下最低为0.6335mg·g^(-1)。幼苗受到盐胁迫,植株的丙二醛含量先升高后降低,0.075 mol·L^(-1)NaCl时达到最高为6.734μmol·L^(-1);过氧化物酶(POD)活性随盐胁迫程度加剧而逐渐升高,0.1mol·L^(-1)NaCl时最高,为30.439μg·g^(-1)·min^(-1)。茄子幼苗的Pn、Tr、Gs、Ci均随着盐胁迫程度加剧而逐渐降低,0.05mol·L^(-1)NaCl时水分利用效率(WUE)最高为1.7262。该茄子品种在枸杞枝条基质条件下耐盐性临界值为0.05mol·L^(-1)。

Taking eggplant seedlings as test material,and composted substrate of self-prepared Lycium barbarum branch powder(CS-LBP)as substrate,the comparison of agronomic properties and physiological indexes of eggplant seedlings was conducted,the effects of salt stress on eggplant seedlings grown in CS-LBP were studied,in order to provide reference for seedling production in CS-LBP under saline water irrigation in Northwest China.The results showed that the plant height and stem diameter of eggplant seedlings showed the lowest values under 0.1mol·L^(-1)NaCl treatment,which were 5.8705cm and 1.2608mm and decreased by 38.36%and 37.87%as compared to CK,respectively.Salt stress significantly inhibited the accumulation of dry matter mass of eggplant seedlings,which was decreased by 17.34%,37.93%,72.22%and 37.93%,respectively,compared with CK,along with the increase of salt solution concentration.Moreover,the seedling quality index gradually decreased with the increase of salt solution concentration,which were 11.51%,17.76%,28.60%and 56.33%lower than CK,respectively.Salt stress did not significantly inhibit the root length of seedlings but seriously inhibited the root activity.The chlorophyll content of seedlings decreased with the increase of salt solution concentration and showed a minimum(0.6335mg·g^(-1))under the 0.1mol·L^(-1)NaCl treatment.Under salt stress,the MDA content of seedlings increased and reached a maximum at 0.075mol·L^(-1)(6.734μmol·L^(-1)),and then decreased gradually.In contrast,the POD activity increased gradually with the increase of salt stress severity and reached a maximum(30.439μg·g^(-1)·min^(-1))at 0.1mol·L^(-1).The Pn,Tr,Gs and Ci of eggplant seedlings decreased gradually with the increase of salt stress severity.The highest WUE was 1.7262,which was observed under 0.05mol·L^(-1)treatment.Together,these results suggested that the critical value of salt tolerance of the eggplant variety was 0.05mol·L^(-1)under the condition of CS-LBP.