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Agricultural Reviews
Print ISSN: 0253-1496
Online ISSN: 0976-0741
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4.84

Chief Editor:
Pradeep K. Sharma
Sher-e-Kashmir Uni. of Agri. Sciences and Technology, J&K, INDIA
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Agricultural Reviews, volume 30 issue 4 (december 2009) :

ENGINEERING TEMPERATURE TOLERANCE IN AGRICULTURAL CROPS

D S Gill, Tilak Raj
1Department Botany Punjab Agricultural University Ludhiana 141004 (Punjab) India.

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Cite article:- Gill S D, Raj Tilak (2025). ENGINEERING TEMPERATURE TOLERANCE IN AGRICULTURAL CROPS. Agricultural Reviews. 30(4): . doi: .

ABSTRACT

Temperature stress due to high temperature is a major problem in agriculture in many areas.
Continuously increasing temperature cause an disorder of physiological and biochemical changes in
crop plants, which affects many growth process i.e. different phenological stages of the crops and
development that may lead to a sharp reduction in grain yield. The detrimental effect of temperature
stress can be mitigated by developing crop plants with thermotolerance using various approaches. For
this, purpose a complete understanding of physiological responses of crop plants to increased
temperature, and possible approaches for improving crop thermotolerance is important. Temperature
stress affects plants development throughout its ontogeny. The threshold levels of temperature differ
considerably at different phenological stages of the crops plants that is during seed germination, the
high temperature the adversely affect photosynthesis, respiration, water relations and membrane
stability, and also changes in hormones and primary and secondary metabolites. Furthermore,
enhanced expression of various heat shock proteins other stress related proteins and production of
reactive oxygen species contribute towards major plants responses to high temperature throughout
plants ontogeny. In order to cope with thermotolerance, various mechanisms including membrane
thermal stability, production of antioxidants, accumulation and adjustment of osmolytes and calcium
dependent proteins kinase, and most importantly transcriptional activation. All these mechanism
which are regulated at the molecular level enable the plants to improve under temperature stress.
Based on thorough understanding of all these mechanisms, potential genetic approaches to improve
plant thermotolerance include molecular breeding and transgenic strategy. There are several examples
of plants with improved thermotolerance through the use of breeding programme. The genetic
transformation approach has been far restricted. This is due to incomplete knowledge and availability
of genes with known effects on thermotolerance plants. There, is an other approach by which heat
tolerance can be increased by preconditioning of plants under various environmental stress or the
osmoprotectants exogenous application that is glycinebetaine and proline. Acquired heat tolerance is
an active process by which considerable amount of plants resources are diverted to structural and
functional maintance to avoid detrimental effect caused by increased temperature. The physiological
and biochemical basis of heat tolerance in crop plants are well known, further studies on assimilate
partitioning under temperature stress and traits controlling crop thermotolerance are needed. These
studies combined with genetic strategies to identify and map genes conferring thermotolerance will
not enhance markers-assisted breeding forthermotolerance but also provided the way for cloning and
characterization of various factors which could be advantageous for engineering crop plants with
improved thermotolerance

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