Demonstrates increased photosynthetic rates in rice hybrids, suggesting genetic advantages.
Three indica rice restorer lines, Mianhui725, Shuhui527, Shuhui881, an American rice variety Lemont and a javanica rice Xiangdali were crossed with Japanese japonica Kitaake. Studies of photosynthetic characteristics indicated that under strong photosynthetic flux density (PFD), the net photosynthetic rate (Pn) that 5 F₁ hybrids reached was significantly higher than that of their own parents or one of them. According to the findings about stomatal conductance (Gs) and intercellular CO₂ concentration (Ci), differences in Rubsico activity in leaves might exist among parents and hybrids. During the investigation of photosynthetic indexes such as Quantum efficiency (ϕ), Carboxylation efficiency (CE) and CO₂ compensation point (Γ), the intersubspecific hybrids F₁ Mianhui725/Kitaake, Shuhui527/Kitaake, and Shuhui881/Kitaake had significant photosynthetic heterosis as compared with the intersub-subspecific hybrids Xiangdali/Kitaake (javanica/japonica)、Lemont/Kitaake (japonica/japonica). Moreover, Shuhui881 had some japonica consanguinity, which made Shuhui 881/Kitaake with less photosynthetic heterosis than Mianhui725/Kitaake or Shuhui527/Kitaake. Therefore, the photosynthetic heterosis of 5 F₁ hybrids existed in their genetic differences, and the typical intersubspecific hybrids Mianhui725/Kitaake and Shuhui527/Kitaake were better than others.
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LI et al. (2005) studied this question.
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