study of germination and emergence of monogerm seed of sugar beet cultivars under moisture stress
نویسندگان
چکیده
in order to further understand the emergence and germination of sugar beet monogerm cultivars under moisture stress, the current study was carried out at three stages. at the first stage, the quality of germination of three monogerm cultivars (rizofort, rasoul and zarghan) were studied under five moisture stress levels (0, -2, -4, -6 and -8 bars) in germinator at 15°c by between-paper method. at this stage, after the onset of the germination, the number of germinated seeds was daily counted and at the end, germination percentage and rate was determined. the second stage was similar to the first one with the difference that at this stage, the percentage of normal and abnormal seedlings was determined 14 days after sowing and then, radicle length, coleoptile length and their ratio as well as radicle and coleoptile dry weight and their ratio were measured for each treatment. at the third stage, the studied cultivars were evaluated in clay soil in growth chamber under moisture stress of 17.5, 20, 22.5 and 25% (control) of soil volumetric moisture. at this stage, when emergence started, the number of emerged seeds was daily counted and then, emergence rate, days to 50% emergence and final emergence percentage were determined for each cultivar and treatment. the statistical design of all stages was a two-factor factorial (the levels of the factors were different at each stage depending on the number of treatments) based on a randomized complete block design with four replications. the studies were carried out in the laboratories of agricultural and natural resources research center of kermanshah, iran. results of the first study showed that moisture stress significantly impacted germination percentage and days to 50% germination, so that as moisture stress was intensified, germination percentage decreased. also, results revealed that germination percentage of cv. rizofort was higher than that of rasoul and zarghan. results of the second study indicated that moisture stress significantly affected normal seedlings and ungerminated seeds at 1% probability level. according to the results of the third study too, moisture stress significantly influenced emergence percentage, emergence rate and days to 50% emergence. results showed that the emergence of sugar beet seeds dramatically decreased at soil volumetric moisture level of lower than 17.5% (-6 bars soil tension) and the emergence percentage of sugar beet seeds did not significantly change with the increase in clay soil volumetric moisture level from 20 to 25% (soil tension of -3 to -0.3 bars).
منابع مشابه
effect of seed priming and irrigation regimes on yield,yield components and quality of safflowers cultivars
این مطالعه در سال 1386-87 در آزمایشگاه و مزرعه پژوهشی دانشگاه صنعتی اصفهان به منظور تعیین مناسب ترین تیمار بذری و ارزیابی اثر پرایمینگ بر روی سه رقم گلرنگ تحت سه رژیم آبیاری انجام گرفت. برخی از مطالعات اثرات سودمند پرایمینگ بذر را بر روی گیاهان مختلف بررسی کرده اند اما در حال حاضر اطلاعات کمی در مورد خصوصیات مربوط به جوانه زنی، مراحل نموی، عملکرد و خصوصیات کمی و کیفی بذور تیمار شده ژنوتیپ های م...
Evaluation of some drought tolerance genes expressions and enzymatic changes in sugar beet monogerm cultivars under drought stress conditions
Sugar beet is a strategic and industrial crop and important in sugar production. Drought is a limited factor in sugar beet yield. Base on this, an experiment carried out using a split-plot format in the randomized complete block design with 4 replications in 1394-5 at Chenaran area (Bahman Jan village). The main plot included three drop irrigation regimes: 7, 14 and 21 days interval as normal, ...
متن کاملestimation of base temperature and the investigation of germination and field emergence trend of monogerm sugar beet under various temperatures
to determine suitable planting date and predicting emergence time in field conditions of iranian sugar beet cultivars we need some information including base temperature (t base) and heat units (hu). in this research germination tests were conducted on the seed of seven iranian monogerm sugar beet cultivars at various temperatures (3 to 36 ºc) with 3 ºc intervals. also field emergence was evalu...
متن کاملphysiological factors limiting germination of monogerm sugar beet seed, 1- inhibitory function of the seed cap
seed cap tightness is known to be highly associated with the low germinability of sugar beet fruits. despite, accomplishment of physiological phases of germination in germinating sugar beet seed with a tight cap, seedling emergence is usually suppress by the cap. as the seed coat (including the cap) is originated from ovary wall of the mother plant, seed cap tightness could be considered as one...
متن کاملthe study of practical and theoretical foundation of credit risk and its coverage
پس از بررسی هر کدام از فاکتورهای نوع صنعت, نوع ضمانت نامه, نرخ بهره , نرخ تورم, ریسک اعتباری کشورها, کارمزد, ریکاوری, gdp, پوشش و وثیقه بر ریسک اعتباری صندوق ضمانت صادرات ایران مشخص گردید که همه فاکتورها به استثنای ریسک اعتباری کشورها و کارمزد بقیه فاکتورها رابطه معناداری با ریسک اعتباری دارند در ضمن نرخ بهره , نرخ تورم, ریکاوری, و نوع صنعت و ریسک کشورها اثر عکس روی ریسک اعتباری داردو پوشش, وثی...
15 صفحه اولEffect of Nitrogen and Phosphorus Bio Fertilizers on Some Seed Germination Traits of Two Cultivars of Quinoa under Salinity Stress
Introduction: salinity is known as the most important inhibitor of seed germination of most plants and limits the establishment of plants in arid and semi-arid regions such as Iran. The first effects of salinity on plant growth are associated with reduced seed germination and lack of uniformity in plant emergence. Currently, identification and utilization of tolerant cultivars are one of the mo...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
چغندرقندجلد ۲۷، شماره ۲، صفحات ۱۵۲-۱۳۵
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023