بانک مقالات کشاورزی و باغبانی و گیاه پزشکی
بانک مقالات کشاورزی و باغبانی و گیاه پزشکی فارسی انگلیسی ترجمه
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پاییز  95  برشما عزیزان  تبریک و تهنیت باد



نوع مقاله : انگلیسی  با ترجمه

مرتبط با : مرتعداری  - اکولوژی

عنوان مقاله  :   A method to incorporate phenology into land cover change analysis.

مرجع مقاله : journal range management

سال انتشار: ٢٠٠١

تعداد صفحات : ٨ صفحه ( دانلود متن انگلیسی در ١دقیقه -دانلود ترجمه در٢دقیقه)

دانلود مقاله شماره ٨٣

تاثیر نیتروژن بررشد و جوانه زنی بذور
ارسال شده توسط سیدمهدی شمس تاریخ ارسال : شنبه ۱۳۸۸/۸/۳٠

نوع مقاله : انگلیسی - کامل

مرتبط با : مرتعداری  - کشاورزی پایدار - اکولوژی - علف های هرز

عنوان مقاله  :   Nitrogen effects on seed germination and seedling growth.

مرجع مقاله : journal range management

سال انتشار: ٢٠٠٣

تعداد صفحات : ٧ صفحه

دانلود مقاله شماره ٨٢

اثر علف کش بر رشد گونه ای از گیاهان در مناطق ساوانا
ارسال شده توسط سیدمهدی شمس تاریخ ارسال : جمعه ۱۳۸۸/۸/٢٩

نوع مقاله : انگلیسی - کامل

مرتبط با : مرتعداری  - کشاورزی پایدار - اکولوژی - علف های هرز

عنوان مقاله  :   Herbicide effects on vegetation spatial patterns in a mesquite savanna.

مرجع مقاله : journal range management

سال انتشار: ٢٠٠٣

تعداد صفحات :۶ صفحه

دانلود مقاله شماره  ٨١

نوع مقاله : انگلیسی - با ترجمه فارسی

مرتبط با : مرتعداری  - کشاورزی پایدار - اکولوژی - تنش های محیطی - رابطه آب و خاک

عنوان مقاله  :  Big sacaton and endophyte-infected Arizona fescue germination under water stress.

 

 

 

مرجع مقاله : journal range management

سال انتشار: ٢٠٠٣

تعداد صفحات :٧ صفحه

دانلود مقاله شماره  ٨٠

دانلود ترجمه مقاله شماره 80

درصد رشد جوانه زنی در گونه ای از براسیکاسه
ارسال شده توسط سیدمهدی شمس تاریخ ارسال : جمعه ۱۳۸۸/۸/٢٩

نوع مقاله : انگلیسی - کامل

مرتبط با : مرتعداری  - کشاورزی پایدار - اکولوژی - حاصلخیزی - دامپروری

عنوان مقاله  :   Brassica elongata ssp. integrifolia seed germination.

مرجع مقاله : journal range management

سال انتشار: ٢٠٠٣

تعداد صفحات : ۴ صفحه

دانلود مقاله شماره ٧٩

Germination of a bean
ارسال شده توسط سیدمهدی شمس تاریخ ارسال : پنجشنبه ۱۳۸۸/۸/٢۸

تصویر میکروسکوپی از جوانه زنی لوبیا تحت اثر هورمن 1h nmr

Germination of a bean studied by 1H NMR microimaging

NMR-MRI تکنولوژِی زیستی جدیدیست که در اختیار موسسه پزشکی  از فرانهوفر قرار دارد.

این عکس از ۴ اسلاید تشکیل شده

  

 

What is seed dormancy
ارسال شده توسط سیدمهدی شمس تاریخ ارسال : پنجشنبه ۱۳۸۸/۸/٢۸

What is seed dormancy and how is it related to germination? - Definition of seed dormancy

خواب بذر چیست و چه رابطه ای با رشدآن دارد

Seed dormancy could be considered simply as a block to the completion of germination of an intact viable seed under favourable conditions. In our Tansley review 'Seed dormancy and the control of germination' (Finch-Savage and Leubner-Metzger, 2006) we present an integrated view across the evolution, molecular genetics, physiology, biochemistry, modelling and ecophysiology of the control of seed germination by dormancy in an attempt to draw together these linked, but often separate disciplines.

Definition of seed dormancy: A more sophisticated and experimentally useful definition of dormancy has been proposed by Baskin and Baskin (2004). A dormant seed does not have the capacity to germinate in a specified period of time under any combination of normal physical environmental factors that are otherwise favourable for its germination, i.e. after the seed becomes non-dormant. A completely non-dormant seed has the capacity to germinate over the widest range of normal physical environmental factors possible for the genotype.

Discussion and opinion: Dormancy is a block to germination has evolved differently across species through adaptation to the prevailing environment so that germination occurs when conditions for establishing a new plant generation are likely to be suitable (Finch-Savage and Leubner-Metzger, 2006 and references therein). A diverse range of dormancy mechanisms (blocks) has evolved in keeping with the diversity of climates and habitats in which they operate. Definitions of dormancy are difficult because dormancy can only be measured by the absence of germination. We can observe completion of germination of a single seed as an all-or-nothing event, whereas dormancy of a single seed can have any value between all (maximum dormancy) and nothing (non-dormancy). Dormancy should not just be associated with the absence of germination, rather it is a characteristic of the seed that determines the conditions required for germination. When dormancy is considered in this way, any environmental cue that alters the conditions required for germination is by definition altering dormancy. Also by extension, when the seed no longer requires specific environmental cues it is non-dormant. Dormancy is a seed characteristic which defines the conditions required for germination and therefore any cue that widens the environmental requirements for germination should be regarded as a dormancy release factor. A wide range of factors can therefore alter (physiological) seed dormancy, e.g. temperature, light, nitrate or naturally occurring chemical signals (ABA and four other terpenes) in leachate from litter that covers the seeds in their habitat. However, there is an important distinction in the seeds response to these factors. 1) There are factors that are related to slow seasonal change. These factors (e.g. temperature) are integrated over time to alter the depth of dormancy, and the sensitivity to other factors (e.g. light). 2) There are other factors that indicate in a more immediate way that conditions are suitable for germination (e.g. light), which could be considered to terminate dormancy and therefore induce germination. Each of these factors therefore remove successive blocks to germination, but this process usually needs to be carried out in a set order for it to work, i.e. in the process described light must come last to be effective. In summary, seed dormancy is an innate seed property, which defines the environmental conditions that must be met before the seed can germinate. The intrinsic molecular mechanisms that determine dormancy have an embryo and/or a coat component. However, dormancy as a “whole seed”-characteristic controls germination and a classification system for seed dormancy has been proposed. See the 'seed dormancy webpage II ' for a phylogenetic table on the dormancy classification.

Primary versus secondary seed dormancy: Freshly harvested mature water-permeable dormant seeds are said to have primary dormancy, which has been induced with the involvement of abscisic acid (ABA) during seed maturation on the mother plant (Finch-Savage and Leubner-Metzger, 2006 and references therein). Subsequent dormancy release “in the field”, following dispersal, may involve the same factors that are commonly used “in the lab”: either after-ripening in the relatively dry state, or dormancy-release treatments in the imbibed state. These imbibed seed treatments include chilling (cold stratification), warm stratification, light, gibberellins (GA) and other hormones (Kucera et al. 2005 and references therein), smoke substances like butenolide and compounds like nitric oxide. In contrast to primary dormancy, secondary dormancy can be induced in seeds with non-deep physiological dormancy after seed dispersal, and is often associated with annual dormancy cycles in the seed bank

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