Effects of Temperature and Water Stress on Some Floral Nectar Characteristics in Ipomopsis longiflora (Polemoniaceae) under Controlled Conditions

1990 ◽  
Vol 151 (1) ◽  
pp. 5-9 ◽  
Author(s):  
Armando G. Villarreal ◽  
C. Edward Freeman
Keyword(s):  
Water Stress ◽  
Floral Nectar ◽  
Controlled Conditions ◽  
Effects Of Temperature

A Possible Role for Abscisic Acid in Controlling Dormancy in Jojoba Flower Buds

1985 ◽  
Vol 12 (5) ◽  
pp. 463 ◽  
Author(s):  
A Benzioni ◽  
RL Dunstone
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Low Temperatures ◽  
Water Status ◽  
Effect Of Temperature ◽  
Flower Buds ◽  
Controlled Conditions ◽  
Effects Of Temperature ◽  
Delayed Flowering ◽  
Endogenous Aba

Jojoba flower buds break dormancy in response to low temperatures in the presence of adequate water. The possibility that abscisic acid (ABA) is involved in the regulation of dormancy was examined by following endogenous ABA levels in flower buds and leaves and by applying synthetic (�)-ABA. Under controlled conditions endogenous levels of ABA were high in dormant flower buds and decreased under conditions of low temperatue that led to flowering. Similar results were obtained in the field. Levels in the leaves were low and changes in response to environmental treatments were small. Daily spraying of the plants with water containing 0.01% Tween enhanced flowering while water stress inhibited it. The application of (�)-ABA delayed flowering and reduced the percentage of flowers open at the end of the experiment. An experiment aimed at distinguishing between the effects of temperature and of water status was inconclusive and part of the effect of temperature on ABA may be related to the effect of temperature on the water status of plant.

The Bolting and Flowering of Chondrilla Juncea L. as Influenced by Temperature and Photoperiod

1968 ◽  
Vol 21 (5) ◽  
pp. 883 ◽  
Author(s):  
O H Caso ◽  
NP Kefford
Keyword(s):  
Gibberellic Acid ◽  
Acid Treatment ◽  
Stem Elongation ◽  
Controlled Conditions ◽  
Effects Of Temperature ◽  
Bolting And Flowering ◽  
Gibberellic Acid Treatment ◽  
Chondrilla Juncea

O. juncea plants were grown in a variety of controlled conditions to determine effects of temperature, photoperiod, and gibberellic acid treatment on stem elongation (bolting) and flowering.

scholarly journals Early-Stage Phenotyping of Root Traits Provides Insights into the Drought Tolerance Level of Soybean Cultivars

Agronomy ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 188
Author(s):  
Elana Dayoub ◽  
Jay Ram Lamichhane ◽  
Céline Schoving ◽  
Philippe Debaeke ◽  
Pierre Maury
Keyword(s):  
Soil Moisture ◽  
Water Stress ◽  
Early Stage ◽  
Canopy Cover ◽  
Early Growth ◽  
Growth Difference ◽  
Controlled Conditions ◽  
Significant Difference ◽  
Soil Moisture Status ◽  
Root And Shoot Traits

Soybean (Glycine max (L.) Merr.) may contribute to the agro-ecological transition of cropping systems in Europe, but its productivity is severely affected by summer drought. New drought-avoidance cropping strategies, such as early sowing, require cultivars with high early plant growth under suboptimal conditions. This study aims at phenotyping early-stage root and shoot traits of 10 cultivars commonly grown in Europe. Cultivars were grown in minirhizotrons under two soil moisture status in controlled conditions. Root and shoot traits were evaluated at 10 days after sowing. Field early growth of two cultivars was also analyzed under early and conventional sowing dates. A significant intraspecific variability (p < 0.05) was found for most investigated shoot and root morpho-physiological traits regardless of the soil moisture status under controlled conditions. However, no significant difference among cultivars (p > 0.05) was found in terms of root architectural traits that were mainly affected by water stress. Total root length was positively correlated with shoot length and shoot dry matter (p < 0.05). Under field conditions, the differences between cultivars were expressed by the canopy cover at emergence, which determines the subsequent canopy cover dynamics. The significant early growth difference among cultivars was not related to the maturity group. Cultivars characterized by high root depth and length, high root density and narrow root angle could be considered as good candidates to cope with water stress via better soil exploration. New agronomic strategies mobilizing the diversity of cultivars could thus be tested to improve soybean water use efficiency in response to climate change.

Studies on frost injury to wheat. I. Laboratory freezing tests in relation to the behaviour of varieties in the field

1961 ◽  
Vol 12 (5) ◽  
pp. 767 ◽  
Author(s):  
WV Single
Keyword(s):  
Marked Change ◽  
Unequal Distribution ◽  
Stages Of Growth ◽  
Commercial Cultivation ◽  
Factors Influencing ◽  
Controlled Conditions ◽  
Frost Injury ◽  
Artificial Freezing ◽  
Effects Of Temperature ◽  
The Relationship

Factors influencing the reactions of different varieties of wheat to stem and ear frosting were studied under controlled conditions and in the field. Artificial freezing tests were successful in demonstrating varietal differences in resistance, but these were not always in agreement with behaviour under commercial cultivation. Thus, whereas the American winter wheat Cheyenne showed resistance superior to that of the Australian varieties Bencubbin and Gabo, the observed superiority of Bencubbin over Gabo in the field was not maintained under controlled conditions. A possible explanation for this anomaly lies in the unequal distribution of temperature which obtains within a crop. On several frosty nights the ears and stems of Gabo, owing to their more forward development, were observed to be in a colder zone than those of Bencubbin. These conditions were not reproduced in the freezing cabinet, and comparisons between plants at different stages of growth failed to show any marked change in resistance with age up to the time of ear emergence. The relationship between temperature of freezing and degree of injury was established under different sets of conditions. In one case interaction between the effects of temperature and variety showed that this factor may be of some importance in the interpretation of results of freezing trials.

scholarly journals Eutrophication Induction Via N/P and P/N Ratios Under Controlled Conditions—Effects of Temperature and Water Sources

2020 ◽  
Vol 231 (4) ◽  
Author(s):  
Jean Diatta ◽  
Zyta Waraczewska ◽  
Witold Grzebisz ◽  
Alicja Niewiadomska ◽  
Natalia Tatuśko-Krygier
Keyword(s):  
Water Sources ◽  
Controlled Conditions ◽  
Effects Of Temperature

Physiological responses of Quercus ilex Leaves to Water Stress and Acute Ozone Exposure Under Controlled Conditions

2007 ◽  
Vol 189 (1-4) ◽  
pp. 113-125 ◽  
Author(s):  
Marcello Vitale ◽  
Elisabetta Salvatori ◽  
Francesco Loreto ◽  
Silvano Fares ◽  
Fausto Manes
Keyword(s):  
Water Stress ◽  
Quercus Ilex ◽  
Physiological Responses ◽  
Ozone Exposure ◽  
Controlled Conditions
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