Chinese Journal OF Rice Science >
Grain Quality as Affected by Down-regulation of Expression of Different ALK Alleles in indica Rice (Oryza sativa L.)
Received date: 2019-08-07
Revised date: 2019-09-13
Online published: 2019-11-10
【Objective】 Gelatinization temperature (GT) is one of the key physicochemical properties in rice quality, which is mainly regulated by ALK (SSII-3) gene. In general, there are two ALK alleles among indica cultivars. To detect their functional differentiation in indica rice,【Method】 Zhenshan 97B (a high GT variety carrying ALKc allele) and Longtefu B (a low GT variety carrying ALKb allele), were used as receptors for the generation of transgenic rice with down-regulation of ALK expression by RNA interference (RNAi).【Result】 Down-regulation of ALK gene significantly decreased the GT of the transgenic lines. Due to the difference of original GT between the two receptors, the GT of transgenic rice lines derived from Zhenshan 97B (a high GT variety) decreased significantly, but it is slightly decreased in transgenic plants derived from Longtefu B (a low GT variety). The differential scanning calorimetry (DSC) results showed that the initial temperature of RNAi transgenic rice was significantly lower than the corresponding control and the transgenic lines were gelatinized in advance. The peak value of GT(Tp) in RNAi rice grains was significantly lower than that of the control under Zhenshan 97B background. However, Tp of RNAi rice grains under Longtefu B background was significantly lower than the control to a lesser extent. Also, down-regulation of ALK expression had a significant effect on rice physical-chemical characteristics. An increase of apparent amylose content in RNAi transgenic plants was detected due to the decreased expression of ALK gene. Besides, the pasting properties showed that down-regulation of ALK gene had obvious effects on peak viscosity and breakdown value, improving the taste of the transgenic rice. The gel consistency was significantly different among Zhenshan 97B RNAi lines and their parents, but no difference was found in Longtefu-derived transgenic lines.【Conclusion】 RNA interference to ALK allele expression had a significant effect on rice quality, especially the gelatinization characters. Down-regulated expression level of ALKc allele would cause larger variation of physical-chemical characteristics between transgenic rice and their parent than that of ALKb allele.
Key words： rice; ALK allele; RNA interference; gelatinization temperature; rice grain quality
Zhuanzhuan CHEN, Xianfeng LI, Min ZHONG, Jiaqi GE, Xiaolei FAN, Changquan ZHANG, Qiaoquan LIU . Grain Quality as Affected by Down-regulation of Expression of Different ALK Alleles in indica Rice (Oryza sativa L.)[J]. Chinese Journal OF Rice Science, 2019 , 33(6) : 513 -522 . DOI: 10.16819/j.1001-7216.2019. 9090
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