What is stress-tolerant crop?
Abiotic Stress-Tolerant Crop s. Plants protect themselves from the detrimental effects of abiotic stresses by increasing the expression of defense or stress tolerance genes. Plant varieties that evolved to have constitutive or high(er) expressed levels of such genes are better adapted to abiotic stress conditions.
How do you develop heat tolerance variety?
Different strategies could be adopted to enhance the thermos-tolerance of rice by (1) the modification of agronomic practices i.e., adjusting sowing time or selecting early morning flowering cultivars; (2) induction of acclimation by using growth regulators and fertilizers; (3) selecting the genetically heat resistant …
Which is the most drought resistant crop?
Staple food crops like sorghum, cassava, sweet potato, pearl millet, cowpea and groundnut are naturally more drought-tolerant than maize. For centuries, farmers in parts of West Africa have grown maize alongside cassava and sweet potatoes.
How does drought affect crops?
Drought can stunt the growth of crops, resulting in a decline in the size and quality of produce. Consumers may expect to see higher prices for local food as farmers cope with lower yields and higher expenses. Limited water availability for washing produce may lead to sanitation and health issues for consumers.
Which crops need high temperature?
Wheat, maize and soybean are three of the world’s most important crops.
Why do we need stress tolerant plants?
Stress-tolerant plants establish a new metabolic homeostasis in response to stress and thereby can continue to grow without suffering stress-induced injury. Tolerance mechanisms are coordinated and fine-tuned by adjusting growth, development, and cellular and molecular activities (Levitt, 1980).
Is rice a drought-resistant crop?
However, rice is considered one of the most drought-susceptible plants due to its small root system, thin cuticular wax, and swift stomata closure .
What crop uses the least water?
Drought Tolerant Vegetables
- Lima beans.
- Pole beans.
- Cowpeas, black-eyed peas and field peas.
- Edible amaranth.
- Mustard greens.
What causes drought stress?
Abstract. Drought (water stress) is one of the most important environmental stresses and occurs for several reasons, including low rainfall, salinity, high and low temperatures, and high intensity of light, among others.
How does water stress affect food supply?
Water stress has a huge impact on food production. Water stress occurs when the demand for water exceeds the available amount during a certain period or when poor quality restricts its use. Without water people do not have a way of watering their crops and, therefore, to provide food for the fast growing population.
What is the temperature of rice?
The optimum temperature for rice cultivation is between 25°C and 35°C, and in temperate regions, rice growth is impressed by limited period that favours its growth (Reyes et al., 2003) . Exposure to cold temperature affects all phonological stages of rice and lower grain production and yield, too.
What is the temperature required for the growth of rice?
Rice crop needs a hot and humid climate. It is best suited to regions which have high humidity, prolonged sunshine and an assured supply of water. The average temperature required throughout the life period of the crop ranges from 21 to 37º C. Maximum temp which the crop can tolerate 400C to 42 0C.
Are heat stress-tolerant varieties of rice more productive?
Productivity of rice, world’s most important cereal is threatened by high temperature stress, intensified by climate change. Development of heat stress-tolerant varieties is one of the best strategies to maintain its productivity. However, heat stress tolerance is a multigenic trait and the candidate genes are poorly known.
Is there a marker for high temperature stress tolerance in rice?
In conclusion, our study has revealed multiple QTL and associated SNP markers for high temperature stress tolerance in rice. In particular, our results in part explain the nature of high temperature stress tolerance found in “N22” variety.
What is abiotic stress in rice?
Rice (Oryza sativa) is the primary source of food for more than half of the world population. Most rice varieties are severely injured by abiotic stresses, with strong social and economic impact. Understanding rice responses to stress may help breeding for more tolerant varieties.
Do transgenic rice plants react to cold stress?
More importantly, functional assays done with transgenic rice plants overexpressing this gene in a cold sensitive Indica-type background as well as in a more cold tolerant Japonica background showed that certain lines reproducibly had less membrane damage (as measured by EL assays) after cold stress.