Senescence of perennial crops enable continuous harvests after one sowing event. Perennials senesce at adapted rates of their native environments; however, early senescencing crops do not maximize the growing season as nutrient reallocation takes precedence. Chlorophyll degradation and nitrogen reallocation was observed to occur rapidly between mid to late September. Transcriptome analysis on early and late senescencing switchgrass cultivars reveals upregulation of starch metabolism, light reactions, Calvin-Benson Cycle, and anthocyanin synthesis in late senescencing switchgrass. Morphological variations between the two germplasms prolong the growing season of late senescencing switchgrass, maximizing yield. Expression of mRNA as senescence progresses and between the two genotypes reveals potential targets and genes of interest for crop breeding techniques to maximize the growing season of perennial crops, optimize nutrient reallocation, and enhance yield.
|Advisor:||Gonzalez-Hernandez, Jose L.|
|Commitee:||Boe, Arvid, Rohila, Jai S.|
|School:||South Dakota State University|
|School Location:||United States -- South Dakota|
|Source:||MAI 55/04M(E), Masters Abstracts International|
|Subjects:||Plant sciences, Physiology|
|Keywords:||Senescence, Switchgrass, Transcriptome|
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