|Authors: ||A. Bakhsh, M.A.B. Zia, T. Hussain, F.O. Tekeli, A.F. Gokce|
|Keywords: ||status, plant lectins, yield losses, farm productivity|
Transgenic Bt crops were planted on an area of approximately 45 million hectares in combination with herbicide resistance trait in recent years.
The available scientific literature does not show any concrete evidence of cry gene exhibiting resistance against sucking pest particularly in commercialized crops.
Therefore, the common crop protection practice against sucking pests is the application of chemical insecticides both for transgenic and non transgenic crops.
The increased pest status and resistance to chemical insecticides provide impetus for the development of alternative management strategies.
Lectins are carbohydrate-binding proteins that specifically recognize glycans of glycoproteins, glycolipids or polysaccharides with high affinity and mediate various cell-cell and host-pathogen interactions, besides innate immune responses.
The ability of plant lectins to control sap-sucking insects is considered as most significant as these devastating pests are unresponsive to insecticidal Bt genes and are constant threat to crops by damaging them directly or by acting as vector for different pathogens.
Different researchers worldwide have established the successful efficacy of plant lectins against sucking insect pest in transgenic rice, tobacco, oilseed rape, potato, wheat, maize, chickpea and cotton.
Among various plant lectins introduced in crops, the monocot mannose binding lectins i.e. garlic (Allium sativum L. leaf agglutinin, ASAL), onion (Allium cepa L. agglutinin, ACA), snowdrop (Galanthus nivalis L. agglutinin, GNA) has exhibited quite promising and significant resistance to jassids (Amrasca devastans), whiteflies (Bemisia tabaci) and aphids (Aphis gossypii). The present study focuses the research endeavours in various transgenic crops expressing plant lectins gene(s) against sucking pests of crop plants.
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