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<p> SWEETs are novel class of sugar effluxers, which have unique functional role in plant biology. Besides nectar production, freezing tolerance, and transport of hexoses across tonoplast and growth-supporting role of pathogens, these SWEETs could have potential role in establishing powerful symbiotic relationship at the root interface and also in feeding to arbuscular mycorrhizal fungi (AMF) symbionts. The microarray or transcriptome expression of SWEET genes from colonized roots revealed that out of 28 Medicago SWEETs, three genes ( MtSWEET1b , MtSWEET3c , and MtSWEET12 ) were induced specifically due to AMF symbiosis. The root type specific expression of these three genes was also enhanced by AMF colonization in rice. The degree of expression of OsSWEET1b , OsSWEET3b , and OsSWEET12 was increased in colonized large lateral roots (LLRM) and crown roots (CRM), while OsSWEET3b and OsSWEET12 were induced in fine lateral roots (FLRM) and CRM, respectively. Promoter regions of these SWEETs represent critical motif elements (MYCS, PB1S, and PHR1) which play critical role in establishment of AMF symbiosis and phosphate starvation-induced responses, respectively. Taken together, these SWEETs have potential to be explored via functional genomics tools to understand feeding mechanisms to symbionts. </p> |
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