Decrease of Pollen Stainability of Green Bean at High Temperatures and Relationship to Heat Tolerance
TL;DR: The results demonstrated that heat tolerance at an early reproductive stage could be evaluated by analyzing pollen stainability using flowers developed under high temperatures, and a heat-tolerant cultivar showed higher pollen Stainability than did heat-sensitive cultivars under high temperature.
read more
Abstract: Phaseolus vulgaris L.) decreased at high temperatures due to a reduction of pod set. A highly positive correlation was observed between pod set and pollen stainability in flowers that were affected by heat stress about 10 days before anthesis. Pollen stainability was decreased by heat stress applied 8 to 11 days before flowering under controlled environment conditions. When mean air temperature during this period exceeded 28 °C, pollen stainability decreased under field conditions. Low pollen stainability indicated sensitivity to high temperatures about 10 days before flowering. A heat-tolerant cultivar showed higher pollen stainability than did heat-sensitive cultivars under high temperatures. These results demonstrated that heat tolerance at an early reproductive stage could be evaluated by analyzing pollen stainability using flowers developed under high temperatures. 70% ± 5%. Exposure to high temperature was initiated at 0900 HR and the plants were transferred back to the greenhouse at 0900 HR the next day. The other plants remained in the greenhouse, as control plants. Every day for 2 weeks after the high temperature treatment, pod set and pollen stainability were examined. Pod set ratio was determined according to the method of Nakano et al. (1998) with some modification. Pod set was determined as the ratio of the total number of pods set 4 d after flowering to the total number of flowers in both the high temperature and control treatments. The total number of flowers examined for pod set during a 14 d period was 1161. For determination of pollen stainability, three to 10 flower buds were fixed in 1 acetic acid : 3 ethanol (v/v) 1 d before flowering. Six to ten anthers from each flower bud were squashed in acetocarmine. Pollen stainability was assessed based on the percentage of wellstained pollen grains. At least 100 pollen grains for each flower bud were used to determine pollen stainability. One flower bud was regarded as a replication, and means and LSD values were calculated. MONITORING POD SET IN FLOWERS THAT WERE EXAMINED FOR POLLEN STAINABILITY. ‘Kentucky Wonder’ green beans were grown in a greenhouse in the same manner as described previously. After the first flower opened, each six plants were transferred to a growth chamber (FLT-1001L; Tokyo-rikakikai Co., Tokyo, Japan) for
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Global hot-spots of heat stress on agricultural crops due to climate change
Edmar Teixeira,Edmar Teixeira,Guenther Fischer,Harrij van Velthuizen,Christof Walter,Frank Ewert,Frank Ewert +6 more
TL;DR: In this article, a spatial assessment of heat stress risk at a global level for four key crops, wheat, maize, rice and soybean, using the FAO/IIASA Global Agro-Ecological Zones Model (GAEZ) is presented.
772
Adverse high temperature effects on pollen viability, seed-set, seed yield and harvest index of grain-sorghum (Sorghum bicolor (L.) Moench) are more severe at elevated carbon dioxide due to higher tissue temperatures
TL;DR: In this paper, the adverse effects of elevated temperature on reproductive processes and yield of grain-sorghum were more severe at elevated CO2 than at ambient CO2; and the beneficial effects of increased CO2 decreased with increasing temperature.
486
Field crops and the fear of heat stress—Opportunities, challenges and future directions
TL;DR: Information on mechanisms leading to heat stress induced sterility is biased towards rice, wheat and sorghum, while the same across other field crops is limited, so increasing research efforts in this direction is critical and timely.
360
Sensitivity of Grain Sorghum to High Temperature Stress during Reproductive Development
TL;DR: Objectives of this research were to quantify the effects of short episodes of HT stress during reproductive development on physiological, growth, and yield processes of grain sorghum and to identify the stage(s) most sensitive during the reproduc- tive development phase to HT stress.
333
Sensitivity of flowering plant gametophytes to temperature fluctuations
TL;DR: Interestingly, a review of the literature on this topic shows that genetic variation does exist in reproductive behavior under temperature fluctuations, and this genetic diversity must be preserved and characterized in further detail to understand how plants naturally cope with changing environmental conditions.
298
References
Response of ovule development and post-pollen production processes in male-sterile tomatoes to chronic, sub-acute high temperature stress
TL;DR: Day temperature, night temperature and DIFs do not need to be considered independently of their effect on mean daily temperature in determining reproductive responses of tomato to temperatures within this range, and the relationship holds true in other species, and for pre-pollen production processes as well.
202
Flower and Pod Abscission Due to Heat Stress in Beans
TL;DR: The effect of high temperature on abscission of bean (Phaseolus vulgaris L.) flowers and pods was studied under growth chamber and greenhouse conditions and found that 82% of heat-stressed structures abscised as small pods in midsummer.
The Effect of Temperature on the Production and Abscission of Flowers and Pods in Snap Bean (Phaseolus vulgaris L.)
TL;DR: The main objective was to elucidate the separate effects of day and night temperatures on pod and seed production, and to define the developmental stages of the plant that are most sensitive to heat stress.
120