中性盐胁迫对百合光合特性及茎叶解剖结构的影响OA

This experiment utilized OT series lily'Red palace'(Lilium'Red palace')bulbs as test material.Different concentrations(0,50,100,150,and 200 mmol·L-1)of neutral mixed salt solution(NaCl and Na2SO4 mass ratio of 1꞉2)were used to simulate saline soil.The effects of saline soil on the photosynthetic characteristics and anatomical structure of stems and leaves of lily were studied,and the salt tolerance threshold of lily was determined.The results showed that low salt(neutral mixed salt concentration≤50 mmol·L-1)promoted the accumulation of photosynthetic pigment content in lily leaves;slightly increased transpiration rate(Tr),stomatal conductance(Gs),and intercellular CO2(Ci)concentration;and increased the leaf number(Nol.),stem diameter(SD),specific stem length(SSL),stem phloem thickness(Ph),vascular bundle diameter(VB),and vessel diameter(D).When the concentration of neutral mixed salt was more than 50 mmol·L-1,the photosynthetic pigment content decreased significantly.Non-stomatal limiting factors led to the decrease in the net photosynthetic rate(Pn),Tr,and Gs of lily leaves,and the characteristic values of stem and leaf anatomical structure continuously decreased.The salt tolerance of stem tissues was higher than that of leaves.Additionally,principal component analysis indicated that appropriate salt stress(50 mmol·L-1)can stimulate the growth of lily plants.In summary,the growth parameters of lily are best when the salt concentration is 50 mmol·L-1.The neutral salt concentration of≤50 mmol·L-1 can be used as an ecologically suitable condition for the optimal growth of this lily variety.