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Information Processing in Agriculture 2018年第3期5卷 339-344页

作者： Rozita Khademi Astaneh Sahebali Bolandnazar fariborz zaare nahandi Shahin Oustan Department of Horticultural Science University of TabrizTabrizIran Department of Soil Science University of TabrizTabrizIran

It is well known that salinity has badly effect on plant growth all over the world and greatly reduces crop production in the affected *** can function as an antioxidant in plants and also in low concentration can promotes plant growth and produce tolerance against *** study was conducted in order to determine the effects of selenium(Se)application(0,4,8 and 16 mg L^-1)on phenylalanine ammonia-lyase(PAL)activity,phenol leakage and total phenolic content of garlic under salt stress(0,30,60 and 90 mM NaCl).The highest PAL activity was recorded at 60 and 90 mM NaCl salinity with application of 8mg Se L^-***,when Se was added to the salt-stress garlic,the level of phenol leakage was decreased significantly at two levels of NaCl concentration(by 52%and 40%at 30 mM NaCl with application of 4 and 16 mg Se L^-1,and by 50%at 90 mM NaCl with application of 4mg Se L^-1,respectively)in comparison to the salt-stressed garlic without *** results showed that Se can increase the salt tolerance of garlic by protecting the cell membrane against lipid *** highest concentration of phenols was recorded at 90 mM NaCl salinity level with application of 4 and 8 mg Se L^-1,that respectively produced 59%and 51%higher phenols than control treatment without ***,application of optimal Se level can increase the potential of garlic in a medium with relatively high level of NaCl.

关键词： Selenium Phenylalanine ammonia lyase(PAL) Phenol Salinity

The effects of selenium on some physiological traits and K, Na concentration of garlic (Allium sativum L.) under NaCl stress

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Information Processing in Agriculture 2018年第1期5卷 156-161页

Selenium,which is an essential microelement for animals,positively affects growth and development of some plants by enhancing the activities of antioxidant *** study was conducted in order to determine the effects of selenium(0,4,8 and 16 mg L^-1)on salt stress(0,30,60 and 90 mM NaCl)subjected garlic plants grown in *** to results,salinity reduced chlorophyll index and carotenoid *** application 8 mg L^-1 in 30 mM NaCl salinity and 4 mg L^-1 in 60 mM NaCl salinity significantly improved chlorophyll index and carotenoid contents,RWC was increased by application of 16 mg L^-1 Se under 90 mM NaCl,in garlic ***,with further increases in Se to the medium containing 30 mM NaCl,K concentration gradually increased in *** of Na content in leaves revealed that Na concentration increases with increasing ***,it is concluded that Se increase in K uptake and decrease in Na uptake under salt stress.

关键词： Carotenoid Chlorophyll Garlic Potassium Salinity Selenium

Cohen-Macaulay Lexsegment Complexes in Arbitrary Codimension

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Algebra Colloquium 2017年第3期24卷 401-406页

作者： Siamak Yassemi Rahim zaare-nahandi School of Mathematics Statistics & Computer Science University of Tehran Tehran Iran

We characterize pure lexsegment complexes which are Cohen-Macaulay in arbitrary codimension. More precisely, we prove that any lexsegment complex is Cohen- Macaulay if and only if it is pure and its 1-dimensional links are connected, and that a lexsegment flag complex is Cohen-Macaulay if and only if it is pure and connected. We show that any non-Cohen-Macaulay lexsegment complex is a Buchsbaum complex if and only if it is a pure disconnected flag complex. For t≥2, a lexsegment complex is strictly Cohen-Macaulay in codimension t if and only if it is the join of a lexsegment pure discon- nected flag complex with a （t - 2）-dimensional simplex. When the Stanley-Reisner ideal of a pure lexsegment complex is not quadratic, the complex is Cohen-Macaulay if and only if it is Cohen-Macaulay in some codimension. Our results are based on a characterization of Cohen-Macaulay and Buchsbaum lexsegment complexes by Bonanzinga, Sorrenti and Terai.

关键词： squarefree lexsegment ideal Cohen-Macaulay complex Buchsbaum complex,flag complex CMt complex

On Generalization of Cycles and Chordality to Clutters from an Algebraic Viewpoint

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Algebra Colloquium 2017年第4期24卷 611-624页

作者： Ashkan Nikseresht Rashid zaare-nahandi Department of Mathematics Institute for Advanced Studies in Basic Sciences P.O. Box 45195-1159 Zanjan Iran

In this paper, we study the notion of chordality and cycles in clutters from a commutative algebraic point of view. The corresponding concept of chordality in commutative algebra is having a linear resolution. We mainly consider the generalization of chordality proposed by Bigdeli et al. in 2017 and the concept of cycles introduced by Can- non and Faridi in 2013, and study their interrelations and algebraic interpretations. In particular, we investigate the relationship between chordality and having linear quotients in some classes of clutters. Also, we show that if e is a clutter such that （） is a vertex decomposable simplicial complex or I（） is squarefree stable, then is chordal.

关键词： chordal clutter squarefree monomial ideal linear resolution cycle simplicialcomplex