Effects of Different Iron Environments on the Growth and Leaf Chlorophyll Fluorescence Characteristics of Blueberry
Iron(Fe)is an essential trace element for plants,which is involved in photosynthesis and affected many important life activities of Vaccinium spp..In order to explore the influence of Fe on the important life activities of blueberry(Vaccinium spp.),the blueberry'Legacy'was used as the material,and 3 Fe environments were set:normal iron(Na-Fe-EDTA),insoluble iron only(Fe2O3)and iron deficiency(without any iron element).The relative chlorophyll content(SPAD value),chlorophyll content and chlorophyll fluorescence parameters of blueberry were analyzed.The results showed that in 2 stress environments of insoluble iron and iron deficiency,the growth indicators,photosynthetic pigment content and SPAD were significantly lower than those under normal iron environment(P<0.05),while the number,growth amount,ground diameter,leaf area and leaf photosynthetic pigment content of basal branches of blueberry under insoluble iron environment were significantly lower than those in iron-deficient environment(P<0.05).The actual photosynthetic efficiency of leaf PSⅡ under normal iron stress were higher than those under insoluble iron and iron deficiency,while the degree of photoinhibition were significantly lower than those under iron stress and iron deficiency.Leaves of seedlings were damaged and photosynthetic capacity of leaves was weakened in iron-insoluble and iron-deficient environments.The photosystem center conversion efficiency was more unstable in iron-insoluble environments than in iron-deficient environments,and blueberry leaves were the most photoinhibited.Leaf area,biomass per plant and growth of basal shoots were significantly correlated with chlorophyll fluorescence parameters(P<0.01),and photosynthetic pigment content of leaves was significantly positively correlated with SPAD value(P<0.01),but there was no significant correlation between photosynthetic pigment and SPAD and fluorescence parameters(P>0.01).In conclusion,insoluble iron,iron deficiency environment made blueberry growth inhibition and resulted in a decreased leaf chlorophyll content,leaf PSⅡ stress environment reaction center absorption and conversion of light energy was abated,electron transfer and photosynthetic efficiency was lower,which provided reference for deep mining for blueberries in iron nutrient reasonable use way.
blueberryironchlorophyll fluorescencegrowth and development
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