16
J. Chen et al.
relief, but scholars of different disciplines. There are different understandings of
early resistance, so different definitions of drought resistance are put forward from
different disciplines. (1) Molecular biologist: drought resistance is caused by water
stress caused by salt or epg. Survival ability of a single cell or cell mass (tissue).
(2) Biochemists: important biochemical reactions, such as the protection of protein
synthesis mrna against water deficit. (3) Plant physiologists: continue to grow under
water stress, The ability to recover rapidly when water stress is lifted. (4) Ecologists: crops can not only survive under atmospheric or soil drought conditions, And
the ability to stabilize the yield at a certain level. (5) Agronomists define drought
resistance as the yield stability of a crop or a variety under the condition of water
shortage.
Drought is the main environmental factor affecting species richness, distribution
and survival, development and growth of individual plants. Plants adopt drought
avoidance, drought resistance and drought tolerance strategies to deal with drought
stress. There is a shortage of water resources in most marginal lands in China. It
is of great significance to evaluate the drought resistance of industrial oil plants in
order to screen and utilize the industrial oil plants with strong drought resistance
and improve the water use efficiency of marginal land. It is the basic work to promote the rapid development of industrial oil plants in marginal land. Plant drought
resistance is a comprehensive response involving the morphological and anatomical
structure of plants, water physiological and ecological characteristics and physiological and biochemical reactions to tissue cells, photosynthetic organs and even
protoplast structures. It is a complex trait controlled by multiple genes. Using a
single index to evaluate plant drought resistance is very limited, and the evaluation
results are often very inconsistent.
Drought resistance identification: at present, the main methods used to study
the drought resistance of crops are field identification method, drought shed or artificial climate box method and laboratory method. The field identification method
is to plant the tested materials directly in the field, and to control the soil moisture
by natural precipitation or irrigation to affect the external morphology or yield of
the plant, in order to evaluate the drought resistance of the varieties. This method
is greatly affected by environmental conditions, takes a long time and has a large
workload, but the method is simple, does not need special equipment and takes the
output as the evaluation index. Therefore, it is easy for breeders to accept it; the
drought shed or artificial simulated climate box method is to sow the tested material
on the soil with controllable moisture, which can study the drought resistance of
different growth stages and the effect of soil moisture on growth and development.
Under the influence of physiological process or yield, this method needs certain
equipment and limited experimental quantity, but it is reliable and reproducible. The
laboratory method is divided into pot method and hyperosmotic solution method.
Pot cultivation (soil culture, sand culture and water culture) is to cultivate plants
of different seedling ages by pot cultivation method, and then transfer the normal
growing seedlings to osmotic solution for dehydration treatment. Dehydration can
be sudden dehydration or dynamic dehydration, but also repeated dehydration. In
this process, some physiological indexes can be determined to reflect the drought
J. Chen et al.
relief, but scholars of different disciplines. There are different understandings of
early resistance, so different definitions of drought resistance are put forward from
different disciplines. (1) Molecular biologist: drought resistance is caused by water
stress caused by salt or epg. Survival ability of a single cell or cell mass (tissue).
(2) Biochemists: important biochemical reactions, such as the protection of protein
synthesis mrna against water deficit. (3) Plant physiologists: continue to grow under
water stress, The ability to recover rapidly when water stress is lifted. (4) Ecologists: crops can not only survive under atmospheric or soil drought conditions, And
the ability to stabilize the yield at a certain level. (5) Agronomists define drought
resistance as the yield stability of a crop or a variety under the condition of water
shortage.
Drought is the main environmental factor affecting species richness, distribution
and survival, development and growth of individual plants. Plants adopt drought
avoidance, drought resistance and drought tolerance strategies to deal with drought
stress. There is a shortage of water resources in most marginal lands in China. It
is of great significance to evaluate the drought resistance of industrial oil plants in
order to screen and utilize the industrial oil plants with strong drought resistance
and improve the water use efficiency of marginal land. It is the basic work to promote the rapid development of industrial oil plants in marginal land. Plant drought
resistance is a comprehensive response involving the morphological and anatomical
structure of plants, water physiological and ecological characteristics and physiological and biochemical reactions to tissue cells, photosynthetic organs and even
protoplast structures. It is a complex trait controlled by multiple genes. Using a
single index to evaluate plant drought resistance is very limited, and the evaluation
results are often very inconsistent.
Drought resistance identification: at present, the main methods used to study
the drought resistance of crops are field identification method, drought shed or artificial climate box method and laboratory method. The field identification method
is to plant the tested materials directly in the field, and to control the soil moisture
by natural precipitation or irrigation to affect the external morphology or yield of
the plant, in order to evaluate the drought resistance of the varieties. This method
is greatly affected by environmental conditions, takes a long time and has a large
workload, but the method is simple, does not need special equipment and takes the
output as the evaluation index. Therefore, it is easy for breeders to accept it; the
drought shed or artificial simulated climate box method is to sow the tested material
on the soil with controllable moisture, which can study the drought resistance of
different growth stages and the effect of soil moisture on growth and development.
Under the influence of physiological process or yield, this method needs certain
equipment and limited experimental quantity, but it is reliable and reproducible. The
laboratory method is divided into pot method and hyperosmotic solution method.
Pot cultivation (soil culture, sand culture and water culture) is to cultivate plants
of different seedling ages by pot cultivation method, and then transfer the normal
growing seedlings to osmotic solution for dehydration treatment. Dehydration can
be sudden dehydration or dynamic dehydration, but also repeated dehydration. In
this process, some physiological indexes can be determined to reflect the drought