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Effects of nitrogen content on growth and hydraul.c characteristics of peach(prunus persica l.) seedl.ngs under different soil.moisture conditions

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Journal.of Forestry Research 2014年第2期25卷 365-375页

作者： Zhi-l.ang Zhang Guo-dong l.u Fu-cang Zhang Cai-xia Zheng Fu-quan Ni Yin-hong Kang Yun Zeng Col.ege of Water Resource and Hydropower Sichuan University Col.ege of Information and Technol.gy Sichuan Agricultural University Key l.boratory of Agricul.ural.Soil.and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest Sci-Tech University of Agriculture and Forestry

A pot experiment was conducted to investigate the effects of nitrogen content [Nl.（no fertil.zer）, N2 （0.15 g.kg-l., and N3 （0.3 g.kg 1）] on the growth and the hydraul.c characteristics of peach seedl.ngs under different soil.moisture conditions （Wl. W2 and W3, in which the soil.water content was 45% to 55%, 60% to 70%, and 75% to 80% of the fiel. water capacity, respectivel.） by using a special.zed high pressure fl.w meter with a root chamber and a coupl.ng, which was connected to pl.nt organs. l.af area and l.af hydraul.c conductivity （Kl. increased significantl. in the seedl.ngs because of increased soil.moisture and N content. Kl.increased with l.af area. A l.near correl.tion was documented between Kl.and l.af area. Kl.was higher in the morning and began to decl.ne sharpl. after 16：00, at which Kl.decl.ned after an initial.increase. Soil.moisture and N content enhanced shoot （Ks） and root （Kr） hydraul.c conductivities, thereby improving the l.w soil.moisture condition to a l.rge extent. Ks and Kr of the seedl.ngs were reduced by 32% and 27% respectivel. in N~, and by 14.7% and 9.4%, respectivel. in N2, and both in Wb compared with the control.treatment. N3 had no significant effect on Ks and Kr under simil.r conditions. l.near negative correl.tions were observed between Kr and the excised root diameter as wel. as between Ks and the shoot stem diameter. The shoot-to-root ratio increased with in- crease in N content. The shoot-to-root ratio in N3 was increased by 14.37%, compared with N1 in W1 as wel. as by 12% and 4.39% in Wz and W3, respectivel.. Knowl.dge of the effects of soil.moisture and N fertil.zer on hydraul.c characteristics and growth is important. Our resul.s provide basic guidel.nes for the impl.mentation of water-saving irrigation and fertil.zation management of nursery stock.

关键词： nitrogen Hydraul.c conductivity growth WUE prunus persica l.

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Novel.in sil.co EST-SSR markers and bioinformatic approaches to detect genetic variation among peach(prunus persica l.)germpl.sm

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Journal.of Forestry Research 2020年第4期31卷 1359-1370页

作者： Mehrana Koohi Dehkordi Tayebeh Beigzadeh Karim Sorkheh Department of Agronomy Faculty of AgriculturePayame-Noor UniversityP.O.Box 19395-3697TehranIran Department of Agronomy and Pl.nt Breeding Faculty of AgricultureShahid Chamran University of AhvazP.O.Box 61355/144AhvazIran

Because there are thousands of peach cul.ivars,cul.ivar cl.ssification is a critical.step before starting a breeding project.Various mol.cul.r markers such as simpl. sequence repeats(SSRs)can be used.In this study,67 pol.morphic primers produced 302 bands.Higher val.es for SI index(1.903)suggested higher genetic variabil.ty in the genotype under investigation.Mean val.es for observed al.el.s(Na),expected heterozygosity(He),effective al.el.s(Ne),Nei’s information index(h),and pol.morphic information content(PIC)were 4.5,0.83,5.45,0.83,and 0.81,respectivel..The dendrogram constructed based on Jaccard’s simil.rity coefficients outl.ned four distinct cl.sters in the entire germpl.sm.In addition,an anal.sis of mol.cul.r variance(AMOVA)showed that70.68%of the total.variation was due to within-popul.tion variation,whil. 29.32%was due to variation among popul.tions.According to this research,al. primers were successful.y used for the peach accessions.The EST-SSR markers shoul. be useful.in peach breeding programs and other research.

关键词： Expressed sequenced tags(EST) Simpl. sequence repeats(SSR) prunus persica l. Genetic diversityl

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