Perennial hybrids of Oryza sativa × Oryza rufipogon. Part II. Carbon exchange and assimilate partitioning

Ming Zhao, Tina L.Botwright Acuña, H. R. Lafitte, Glenn Dimayuga, Erik J Sacks

Research output: Contribution to journalArticle

Abstract

Oryza species differ in their degree of perenniality, which has implications for patterns of carbon distribution in the plant. Interspecific F1 hybrids of Oryza sativa × Oryza rufipogon were compared with their parental lines to assess whether they differed in assimilate storage and distribution at flowering and after maturity of the first cohort of panicles. The F1 hybrids varied widely in plant type, but on average they had small plant size and low main tiller weights at anthesis, similar to O. rufipogon, and had intermediate tiller numbers and final single plant weights similar to cultivated rice. O. rufipogon had higher concentrations of starch in stems at anthesis, while interspecific hybrids exhibited comparatively low leaf, stem + sheath, and root sugar concentrations. Near anthesis, substantial 14C label remained in the source (flag) leaf in O. sativa and F1 hybrids, while in O. rufipogon more label was exported to sink tissues. The hybrids partitioned more 14C label to panicles than did cultivated rice and less to leaf sheaths than either parent. Hybrids that had previously been identified as having above-average carbon exchange rates (CER) did not differ consistently from the low-CER hybrids in carbohydrate dynamics. The cultivated species itself maintains some perennial features, and changes in these traits might increase productivity.

Original languageEnglish (US)
Pages (from-to)214-223
Number of pages10
JournalField Crops Research
Volume106
Issue number3
DOIs
StatePublished - Mar 20 2008
Externally publishedYes

Fingerprint

Oryza rufipogon
Oryza sativa
partitioning
carbon
flowering
exchange rate
inflorescences
rice
stem
leaves
stems
Oryza
starch
carbohydrate
sugar
carbohydrates
sugars
productivity

Keywords

  • C
  • Non-structural carbohydrate
  • O. rufipogon
  • O. sativa
  • Oryza
  • Perenniality
  • Photosynthesis
  • Rice
  • Source-sink

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

Cite this

Perennial hybrids of Oryza sativa × Oryza rufipogon. Part II. Carbon exchange and assimilate partitioning. / Zhao, Ming; Acuña, Tina L.Botwright; Lafitte, H. R.; Dimayuga, Glenn; Sacks, Erik J.

In: Field Crops Research, Vol. 106, No. 3, 20.03.2008, p. 214-223.

Research output: Contribution to journalArticle

Zhao, Ming ; Acuña, Tina L.Botwright ; Lafitte, H. R. ; Dimayuga, Glenn ; Sacks, Erik J. / Perennial hybrids of Oryza sativa × Oryza rufipogon. Part II. Carbon exchange and assimilate partitioning. In: Field Crops Research. 2008 ; Vol. 106, No. 3. pp. 214-223.
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