Heterosis for photosynthesis and dry matter accumulation in F1 hybrid rice (Oryza sativa L.) produced from thermo-sensitive male sterile line under drought stress at heading stage

Pham Van Cuong, Hoang Viet Cuong, Tang Thi Hanh, Duong Thi Thu Hang, Takuya Araki, Toshihiro Mochizuki, Atsushi Yoshimura

Research output: Contribution to journalArticle

Abstract

Heterosis is defined as increased vigour of hybrids in comparison to their parents. In this study, seven cultivars of upland inbred rice (male parents) and their F, hybrids generated by crossing with a thermo-sensitive genie male sterile (TGMS) 103 line (female parent). The cultivars were examined for characters of photosynthesis and dry matter production under drought stress at flowering stage and recovery at ripening stage. The results showed that under drought, all F1, hybrids exhibited very low negative heterosis for CO2 exchange rate, stomatal conductance, mesophyll conductance and transpiration rate, but high positive heterosis for intercellular CO2 concentration. The heterosis value increased much more in the F1, hybrids under drought recovery than under well-water conditions. During drought stress, heterosis value decreased slightly for dry matter accumulation compared to well-irrigated conditions. Although CO2 exchange rate significantly decreased, dry matter accumulation was maintained in all F1, hybrids after drought recovery, which suggests the potential for using upland rice as male parent to produce F, hybrids from TGMS lines for drought tolerance.

Original languageEnglish
Pages (from-to)221-228
Number of pages8
JournalJournal of the Faculty of Agriculture, Kyushu University
Volume59
Issue number2
Publication statusPublished - Aug 1 2014

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Hybrid Vigor
Droughts
Photosynthesis
heading
heterosis
dry matter accumulation
Oryza sativa
water stress
photosynthesis
rice
drought
highlands
irrigated conditions
cultivars
drought tolerance
mesophyll
stomatal conductance
Oryza
transpiration
ripening

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science

Cite this

Heterosis for photosynthesis and dry matter accumulation in F1 hybrid rice (Oryza sativa L.) produced from thermo-sensitive male sterile line under drought stress at heading stage. / Cuong, Pham Van; Cuong, Hoang Viet; Hanh, Tang Thi; Hang, Duong Thi Thu; Araki, Takuya; Mochizuki, Toshihiro; Yoshimura, Atsushi.

In: Journal of the Faculty of Agriculture, Kyushu University, Vol. 59, No. 2, 01.08.2014, p. 221-228.

Research output: Contribution to journalArticle

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