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Relationship Between the n concentration of the leaf Subtending Boll and the Cotton Fiber Quality

Journal of Integrative Agriculture 2012年第12期11卷 2013-2019页

作者： WAnG You-hua ZHAO Xin-hua CHEn Bing-lin GAO Xiang-bin ZHOU Zhi-guo College of Agriculture Nanjing Agricultural University Cotton Research Institute Chinese Academy of Agricultural Sciences

This experiments were conducted in nanjing （118~50＂E, 32~02＂n） and Xuzhou （117~11 ＂E, 34~15＂n）, Jiangsu Province, China, to study the response of fiber quality to the n concentration of the leaf subtending boll in cotton （Gossypium hirsutum L.）. Results suggested that the n dilution curve of the leaf subtending boll can accurately indicate the stage- specific plant n status for fiber development. Fiber strength is likely to be the most variable fiber quality index responding to the leaf n variation which is different in cultivars. Fiber length was the most stable index among strength, length, micronaire, and elongation. There existed an optimum leaf n concentration for fiber strength development in each stage. The optimum leaf n regression curve was very close to the n dilution curve in the middle positional fruiting branches under the 240 kg n ha-1 soil n application rate.

关键词： cotton fiber quality leaf n concentration cellulose

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Soil Temperature and Maize nitrogen Uptake Improvement Under Partial Root-Zone Drying Irrigation

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Pedosphere 2016年第6期26卷 872-886页

作者： Fatemeh KARAnDISH Ali SHAHnAZARI Assistant Professor Water Engineering DepartmentUniversity of ZabolZabol 35856-98613(Iran) Water Engineering Department Sari Agricultural Sciences and Natural Resources UniversitySari 378(Iran)

Soil temperature is a major effective factor on the soil and plant biological *** can affect soil temperature and thereby induces a temperature effect on plant growth,which may result in an economic increase due to higher yield and plant nutrition.A ?eld experiment was carried out to investigate the effects of three irrigation strategies including full irrigation(FI),partial root-zone drying(PRD) and de?cit irrigation(DI) on soil temperature and the consequent results on the grain yield and n uptake of maize(Zea May L.).Soil temperature was measured by time domain re?ectometry(TDR) sensors during the 2010 growing *** treatments were applied from 55 to 107 d after *** PRD treatment caused soil temperature to be in a favorable domain for a longer period(for over 60% of the measuring dates) as a consequent result of water movement to deeper soil layers compared with the other treatments;the PRD treatment also reduced soil temperature at deeper soil depths to below the maximum favorable soil temperature for maize root growth,which resulted in deeper root penetration due to both water availability and favorable soil *** to the FI treatment,the PRD treatment increased root water uptake by 50% and caused no signi?cant reduction in total n uptake,while this was not observed in the DI treatment partially due to the negative temperature effect of DI on plant growth,which consequently affected the water and nutrient uptake.A longer vegetation period in the PRD treatment was observed due to higher leaf n concentrations and no signi?cant reduction in maize grain yield occurred in the PRD treatment,compared with those in the FI *** on the results,having 15.2% water saving during the whole growing season,the PRD irrigation would positively affect soil temperature and the water and nutrient uptake as a consequent,which thereby would prevent signi?cant reduction in maize grain yield.

关键词： full irrigation deficit irrigation grain yield irrigation strategy leaf n concentration root growth water saving water uptake

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Basal internode elongation of rice as affected by light intensity and leaf area

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The Crop Journal 2020年第1期8卷 62-70页

作者： Xuhua Zhong Kaiming Liang Bilin Peng Ka Tian Xiaojuan Li nongrong Huang Yanzhuo Liu Junfeng Pan Rice Research Institute of Guangdong Academy of Agricultural Sciences Guangzhou 510640GuangdongChina Guangdong Key Laboratory of New Technology for Rice BreedingGuangzhou 510640GuangdongChina

Short basal internodes are important for lodging resistance of rice(Oryza sativa L.).Several canopy indices affect the elongation of basal internodes,but uncertainty as to the key factors determining elongation of basal internodes *** objectives of this study were(1)to identify key factors affecting the elongation of basal internodes and(2)to establish a quantitative relationship between basal internode length and canopy *** inbred rice cultivar,Yinjingruanzhan,was grown in two split-plot field experiments with three n rates(0,75,and 150 kg n ha−1 in early season and 0,90,and 180 kg n ha−1 in late season)as main plots,three seedling densities(16.7,75.0,and 187.5 seedlings m−2)as subplots,and three replications in the 2015 early and late seasons in Guangzhou,*** intensity at base of canopy(Lb),light quality as determined from red/far-red light ratio(R/FR),light transmission ratio(LTR),leaf area index(LAI),leaf n concentration(nLV)and final length of second internode(counted from soil surface upward)(FIL)were *** n rate and seedling density resulted in significantly longer *** was negatively correlated with Lb,LTR,and R/FR(Pnd positively correlated with LAI(Pnot correlated with nLV(P>0.05).Stepwise linear regression analysis showed that FIL was strongly associated with Lb and LAI(R2=0.82).Heavy n application to pot-grown rice at the beginning of first internode elongation did not change *** conclude that FIL is determined mainly by Lb and LAI at jointing *** has no direct effect on the elongation of basal internodes.n application indirectly affects FIL by changing LAI and light conditions in the rice *** LAI and improving canopy light transmission at jointing stage can shorten the basal internodes and increase the lodging resistance of rice.

关键词： Internode elongation leaf area index Light intensity Light quality R/FR,Light transmission ratio leaf n concentration

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Ontogenetic transition in leaf traits: a new cost associated with the increase in leaf longevity

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Journal of Plant Ecology 2014年第6期7卷 567-575页

作者： Sonia Mediavilla Maria Herranz Patricia González-Zurdo Alfonso Escudero Departamento de Ecología Facultad de BiologíaUniversidad de SalamancaSalamanca 37071Spain

Aims Recent work has identified a worldwide‘economics’spectrum of correlated leaf traits that mainly reflects the compromises between maximizing leaf longevity and short-term ***,during the early stages of tree growth different species tend to exhibit a common strategy,because competition for soil water and nutrients forces the maximization of short-term productivity owing to the need for rapid growth during the most vulnerable part of the tree’s life ***,our aim here was to compare the variations that occur during ontogeny in the different leaf traits(morphology and leaf chemical composition)of several coexisting Mediterranean woody species differing in their leaf life spans and to test our hypothesis that tree species with a long leaf life span should exhibit larger shifts in leaf characteristics along *** Six Mediterranean tree species differing in leaf life span,selected from three plots located in central-western Spain,were studied during three growth stages:seedlings,juveniles and mature *** life span,leaf morphology(leaf area,dry weight,thickness and mass per unit area)and chemical composition(n and fibre con-centrations)were measured in all six *** magnitude of the ontogenetic changes in the different traits was estimated and related to the mean leaf longevity of the different *** Findings Along ontogeny,strong changes were observed in all variables *** early growth stages showed lower leaf thickness,leaf thickness and mass per unit area and n,cellulose and hemi-cellulose concentrations than mature trees,but a higher lignin ***,these changes were especially marked in species with a longer leaf life span at *** dif-ferences in leaf life span,leaf morphology and chemical com-position were stronger at the mature stage than at the seedling *** conclude that greater plasticity and more intense strat-egy shifts along ontogeny are necessarily associ

关键词： leaf morphology leaf n concentration fibre content Pinus Quercus tree age class

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leaf traits indicate survival strategies among 42 dominant plant species in a dry, sandy habitat, China

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Frontiers in Biology 2009年第4期4卷 477-485页

作者： Jinhuan LIU Dehui ZEnG Zhiping FAn David PEPPER Guangsheng CHEn Lei ZHOnG Daqinggou Ecological Station Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China School of Biological Earth and Environmental SciencesThe University of New South WalesSydney NSW 2052Australia School of Forestry and Wildlife Sciences Auburn UniversityAL 36830USA Graduate School of Chinese Academy of Sciences Beijing 100049China

The objective of this paper was to assess the congruency of leaf traits and soil characteristics and to analyze the survival strategies of different plant functional types in response to drought and nutrient-poor environ-ments in the southeastern Ke’erqin Sandy Lands in *** leaf traits—leaf thickness(TH),density(Dn),specific leaf area(SLA),leaf dry weight to fresh weight ratio(DW/FW),leaf n concentration(n mass),and n resorption efficiency(nRE_(mass))-of 42 plant species were investi-gated at four *** correlations between leaf traits and soil characteristics-organic C(OC),total n(Tn),total P(TP),and soil moisture(SM)-were *** found that the six leaf traits across all the 42 species showed large variations and that DW/FW was negatively correlated with OC,Tn,TP,and SM(Pleaf traits showed no significant correlations with soil *** find the dissimilarity to accommodate environment,a hierarchical agglomerative clustering analysis was made of all the *** the species clustered into three groups except the Scutellaria *** of group III might be most tolerant of an arid environment,and species of group II might avoid nutrient stress in the nutrient-poor environment,while group I was somewhat ***,species from the different groups may be selected for use in vegetation restoration of different sites based on soil moisture and nutrient conditions.

关键词： leaf thickness leaf density specific leaf area leaf dry matter content leaf n concentration n resorption efficiency

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