氮磷添加对黑果枸杞(Lycium ruthenicum)营养器官非结构性碳水化合物特征的影响

非结构性碳水化合物(NSC)在植物生长、繁殖、防御和生存等方面发挥着基础性作用.为探究黑果枸杞(Lyciumruthenicum)NSC积累的器官间规律及其对土壤氮磷供应水平的响应,以3年生黑果枸杞为对象,测定了3个氮磷比例和供应量条件下根茎叶NSC含量.结果表明:(1)黑果枸杞根、茎、叶NSC组成均以可溶性糖为主,淀...

Effects of nitrogen and phosphorus addition on non-structural carbohydrate properties of vegetative organs in Lycium ruthenicum

Non-structural carbohydrates(NSC)played a fundamental role in plant growth,reproduction,defense and survival. To explore the effects of N and P addition on NSC of Lycium ruthenicum,a field manipulation experiment combined three nutrient supply levels(Low,Medium,High)and three N:P supply ratios(5∶1,15∶1,45∶1)was conducted on three-year-old L. ruthenicum. The results indicated that:(1)Soluble sugar was the major contributor to the total NSC in different organs,starch accounts for about 37.3%. On average,the concentrations of NSC in different organs followed the order of:coarse roots & fine roots>leaves>current-year>one-year&two-year branches. The concentrations of soluble sugar,starch and the ratio of soluble sugar to starch followed the order of coarse roots & fine roots>leaves>current-year branches>one-year branches>two-year branches;fine roots>coarse roots>two-year branches>one-year branches>leaves & current-year branches;leaves>current-year branches>coarse>one-year branches>two-year branches>fine roots respectively.(2)Changes in soluble sugar,starch and NSC concentrations in different organs of L. ruthenicum. reflected significant interactions between N∶P supply ratios and supply levels. When the N∶P supply ratios was 5∶1,the NSC concentrations of leaves and branches was higher under high supply level,when the N∶P was 15∶1,the NSC and its components concentrations of leaves,current-year and one-year branches in the low supply level is significantly higher than the high supply level,when the N∶P was 45∶1,the NSC concentrations of leaves,one-year and two-year branches in high level of supply is significantly higher than low supply level. N∶P supply ratios and supply level had no significant effect on root soluble sugar concentrations.(3)The NSC concentrations of one-year branches reached the maximum value(5.05% DW)before germination and dropped to the lowest value(3.79% DW)during the shoot growth period;NSC concentrations of two-year branches decreased before germination(4.23% DW)and reached the maximum value in the foliage period(4.33% DW).(4)The NSC concentrations of coarse roots was negatively correlated with NSC concentrations of leaves、one and two-year branches;NSC concentrations of current-year branches was positively correlated with NSC concentrations of leaves and starch content of two-year branches;soluble sugar concentrations of one-year branches was negatively correlated with that of two-year branches;starch concentrations of two-year branches was negatively correlated with starch and NSC concentrations of coarse roots.When compared the impact of N and P addition on NSC concentrations of vegetative organs of L. ruthenicum,the results showed obvious organ difference adapted to N and P supply condition by adjusting accumulate and distribute NSC in different organs. Choosing to store more NSC in root system can enhance carbon balance and survivability in a nutrient-restricted environment,and also provide greater flexibility for the interaction with the non-biological environment.