Sterile Spikelets Contribute to Yield in Sorghum and Related Grasses.

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ID: 265169
2020
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Abstract
Sorghum (Sorghum bicolor) and its relatives in the grass tribe Andropogoneae bear their flowers in pairs of spikelets in which one spikelet (seed-bearing or sessile spikelet [SS]) of the pair produces a seed and the other is sterile or male (staminate). This division of function does not occur in other major cereals such as wheat (Triticum aestivum) or rice (Oryza sativa). Additionally, one bract of the SS spikelet often produces a long extension, the awn, that is in the same position as, but independently derived from, that of wheat and rice. The function of the sterile spikelet is unknown and that of the awn has not been tested in Andropogoneae. We used radioactive and stable isotopes of carbon, RNA sequencing of metabolically important enzymes, and immunolocalization of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) to show that the sterile spikelet assimilates carbon, which is translocated to the largely heterotrophic SS. The awn shows no evidence of photosynthesis. These results apply to distantly related species of Andropogoneae. Removal of sterile spikelets in sorghum significantly decreases seed weight (yield) by ∼9%. Thus, the sterile spikelet, but not the awn, affects yield in the cultivated species and fitness in the wild species.
Reference Key
aubuchonelder2020sterilethe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors AuBuchon-Elder, Taylor;Coneva, Viktoriya;Goad, David M;Jenkins, Lauren M;Yu, Yunqing;Allen, Doug K;Kellogg, Elizabeth A;
Journal The Plant cell
Year 2020
DOI
10.1105/tpc.20.00424
URL
Keywords
phylogeny ani chinese cabbage (brassica rapa l. ssp. pekinensis) pectobacterium polaris bacterial soft rot phenotypic characteristics specific pcr/qpcr detection

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