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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 21, No. 3, 2013, pp. 185-190
Bioline Code: cs13019
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 21, No. 3, 2013, pp. 185-190

 fr SIGNIFICANCE OF RICE SHEATH PHOTOSYNTHESIS: YIELD DETERMINATION BY 14C RADIO-AUTOGRAPHY
ZHAO-WU, GUO; QIANG, H.E. & HUA-FENG, DENG

Résumé

L’usage de l’hybride de riz à rendement élevé, le Liangyopeijiu (LYP9), son parent male 9311 et l’ hybride Shanyou 63 (SY63) comme matériel expérmental, la photosynthèse du riz était étudié par radio-autographie 14C. Les résultats ont montré que le “sheath” du riz pourrait piéger la lumière solaire et produire des photosynthates; ces derniers étaient principalement transportés dans les graines. Les photosynthates 14C transportés dans les graines de LYP9 et 9311 étaient significantly plus élevés que ceux dans SY63 après 72 hr, ce qui a indiqué que ces differences parmi les génotypes ont existé comme taux de contribution de la photosynthèse du sheath au rendement économique. Le transport des photosynthates du 14C aux graines était plus rapide dans les sheaths du LYP9 que dans ceux de 9311 et SY63 à 12 et 72 hr après traitement. L’ hybride de riz ont accomodé l’héterosis et était influencé par les caractères héritables de ses parents. Etant donné que la photosynthèse du sheath du riz est un important supplement au rendement du riz, la photosynthèse non efficiente dans le sheath du riz pourrait causer de sérieuses réduction du rendement.

Mots Clés
Hybride du riz; photosynthates; graines

 
 en SIGNIFICANCE OF RICE SHEATH PHOTOSYNTHESIS: YIELD DETERMINATION BY 14C RADIO-AUTOGRAPHY
ZHAO-WU, GUO; QIANG, H.E. & HUA-FENG, DENG

Abstract

Using high-yielding hybrid rice Liangyopeijiu (LYP9), its male parent 9311 and hybrid rice Shanyou 63 (SY63) as the experimental materials, the photosynthesis of rice sheath was studied by 14C radio-autography. The results showed that rice sheath could trap sunlight and produce photosynthates, and these photosynthates were transported mainly to the spikes. The 14C-labeled photosynthates transported to the spikes of LYP9 and 9311 were significantly more than those of SY63 after 72 hr, which indicated that differences among genotypes existed for contribution rates of sheath photosynthesis to economical yield. Transport of the 14C-labeled photosynthates to the spikes was faster in the sheaths of LYP9 than in those of 9311and SY63 at 12 and 72 hr after treatment. Hybrid rice housed the heterosis and were influenced by the inheritable characters of its parents. Since photosynthesis of rice sheath is an important supplement to rice yield, inefficient photosynthesis in rice sheaths could cause serious yield reduction.

Keywords
Hybrid rice; photosynthates; spikes

 
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