Survey of arenchyma formation on a large collection of two-row feed and malti...

Survey of arenchyma formation on a large collection of two-row feed and malting barley genotypes in response to waterlogging stress

Researchers: Anna Badea
Keywords: Barley Genomics
Start Date: 2017
Status: Complete

Lead Researchers:  Anna Badea, AAFC, BRC
Start Date:  2017
Project Length: 1 Year (2017-2018)
Project Status: COMPLETE

Background:  Waterlogging tolerance is a rather complex trait, both physiologically and genetically. In case of barley, waterlogging stress causes degradation of chlorophyll, protein, and RNA, and also reduces the concentration of nutrients like nitrogen, phosphorus, metal ions, and minerals in shoot. After the onset of flood, leaf chlorosis was initiated, root and shoot growth was also affected which resulted in reduction of accumulation of dry matter and finally in yield. Of all the waterlogging constraints, deprivation of oxygen to plants roots is the main consequence. Waterlogging tolerance is associated with internal gasphase diffusion of O2 from shoots to roots through large interconnected air channels (aerenchyma) (Armstrong, 1979; Colmer 2003; Voesenek and Bailey-Serres, 2015). For root in anaerobic media, receiving O2 via aerenchyma, O2 deficiency (hypoxia) may occur in apical regions of roots and inside the stele (Armsrong, 1979), causing energy deficits. However, in spite of substantial effort to study this trait, the outcome is disappointingly low due to its physiological and genetic complexity. This brings to attention the urgent need for a comprehensive understanding of the mechanism underlying waterlogging tolerance, in order to facilitate breeding of barley waterlogging-tolerant genotypes.

Objectives:  Validation of several genes involved in stress related pathways regulated by waterlogging stress in contrasting barley genotypes
Total Project Cost:  $35,000
MWBGA Funding Approved:  $15,000
Partner funding:  $20,000
Funding Partners: MWBGA, AAFC

Benefits to MB Producers:  Long term tools for barley breeder