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Duan Y.,Fujian Agriculture and forestry University | Diao Z.,Fujian Agriculture and forestry University | Diao Z.,Key Laboratory of Genetic Improvement for Sugarcane | Liu H.,Fujian Academy of Agricultural science | And 4 more authors.
Plant Molecular Biology | Year: 2010

In this article, we report an independent work of positional cloning and functional characterization of OsJAG gene in rice. The merit of our work is that we used a genuine null mutant, in which the wild-type allele was completely deleted. This allowed us to identify the mutant phenotypes accurately without the interference of residual function of the target gene. OsJAG is an important gene with pleiotropy, expressing almost throughout the plant and acting in both vegetative phase and reproductive phase. But its main and crucial roles are in regulating the development of all floral organs, especially in specifying the identity of stamens. Interestingly, OsJAG does not affect the number of floral organ primordial and so of floral organs in each whorl, suggesting that OsJAG does not influence the initiation of floral organ primordia, but affect the developmental fate of all floral organs after their primordia have initiated. Loss of OsJAG function results in maldevelopment of all floral organs, such as degenerated lemma and palea, elongated lodicules and deformed and sterile pistil. The stamen appears to be more sensitive to the mutation. All the six stamens in a mutant floret were thoroughly transformed into six pistil-like organs developed at the presumptive positions of the stamens in whorl 3. © 2010 Springer Science+Business Media B.V.

Chen R.,Key Laboratory of Genetic Improvement for Sugarcane | Yuan Z.,Key Laboratory of Genetic Improvement for Sugarcane
International Sugar Journal | Year: 2010

This paper describes the progress of the sugarcane industry in China, as well as the major characteristics of sugarcane production systems and R&D. Over the past 8 years, production area expanded by 47.87%, total sugarcane production increased by 79.54%, cane yield per hectare by 21.26% and annual sugar production by 83.12%. Sugar consumption in China has also grown steadily. Sugarcane was mainly grown in Central-South Guangxi, Southwest Yunnan, West of Guangdong and Northern Hainan. For energy production from sugarcane, national research projects have been carried out. Pilot study showed that the cost of ethanol production from sugarcane could be reduced to USs$0.50/L, which was more economic than gasoline at US$70 per barrel. The problems facing the industry and their possible solutions are also discussed.

Deng Z.-H.,Key Laboratory of Genetic Improvement for Sugarcane | Zhang M.-Q.,Key Laboratory of Genetic Improvement for Sugarcane | Lin W.-L.,Key Laboratory of Genetic Improvement for Sugarcane | Cheng F.,Guangzhou Sugarcane Industry Research Institute | And 5 more authors.
Agricultural Sciences in China | Year: 2010

Erianthus arundinaceus is an important, closely related genus of Saccharum officinarum L. It is therefore important to understand how the chromosomes are transmitted when it hybridizes with sugarcane. The hybrids and backcross progenies of S. officinarum and E. arundinaceus and their parents were used for Karyotype analysis and to study the law of chromosome transmission. The results showed that the somatic chromosome number of both of the E. arundinaceus Hainan92-105 and Hainan92-77 were 2n = 60 = 60sm, belonging to type 1A, and the BC1 YC01-21 was 2n = 104 = 100m + 4sm, belonging to type 2C. The other six tested clones belonged to type 2B. The both F1s YC96-66 and YC96-40 that originated from Badila (2n = 80 = 70m + 10sm) with E. Arundinaceus were 2n = 70 = 68m + 2sm, which suggests an n + n transmission. The cross between YC96-66 (female parent) and CP84-1198 (male parent, 2n = 120 = 114m + 6sm) also followed the same genetic law and the somatic chromosome number of their progeny, YC01-3 (2n = 105 = 95m + 10sm). The cross derived from YC96-40 (female) and CP84-1198 (male), YC01-21 had 2n = 104 = 100m + 4sm chromosomes, following the same genetic law of n + n. However, YC01-36 had 2n = 132 = 130m + 2sm chromosomes, which suggests a 2n + n chromosome transmission. It can be inferred that the inheritance of chromosomes was very complex in the BC1. The difference in chromosome number between clones was as high as 28. This could be explained by the 2n + n transmission of chromosomes. In addition, as there was not be a regular number of haploids, this phenomenon is termed as disequilibrium hybridization. © 2010 Chinese Academy of Agricultural Sciences.

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