云南省农业科学院粮食作物研究所于2005年育成早熟品种云粳26号，该品种外观特点为: 颖尖无色、无芒，谷壳黄色，落粒性适中，米粒大，有香味，食味品质好，高抗稻瘟病，适宜在云南中海拔 1 500∼1 800 m 稻区种植。2012年被农业部列为西南稻区农业推广主导品种。


隆两优1212 于2017 年引入福建省龙岩市长汀县试种，在长汀县圣丰家庭农场（河田镇南塘村）种植，土壤肥力中等、排灌方便[2]，试种面积 0.14 hm^2 ，作烟后稻种植，6 月15 日机播，7月5 日机插，10 月21 日成熟，产量 8.78 t/hm^2 。2018 和2019 年分别在长汀润丰优质稻专业合作社（濯田镇永巫村）和长汀县绿丰优质稻专业合作社（河田镇中街村）作烟后稻进一步扩大示范种植，均采用机播机插机收。2018 年示范面积 4.00 hm^2 ，平均产量 8.72 t/hm^2 ；2019 年示范面积 13.50 hm^2 ，平均产量 8.74 t/hm^2 。经3 a 试种、示范，隆两优1212 表现出分蘖力强、抗性好、抽穗整齐、后期转色好、生育期适中、产量高、适应性好等特点，可作为烟后稻在长汀县推广种植。


Grain size is one of the key factors determining grain yield. However, it remains largely unknown how grain size is regulated by developmental signals. Here, we report the identification and characterization of a dominant mutant big grain1 (Bg1-D) that shows an extra-large grain phenotype from our rice T-DNA insertion population. Overexpression of BG1 leads to significantly increased grain size, and the severe lines exhibit obviously perturbed gravitropism. In addition, the mutant has increased sensitivities to both auxin and N-1-naphthylphthalamic acid, an auxin transport inhibitor, whereas knockdown of BG1 results in decreased sensitivities and smaller grains. Moreover, BG1 is specifically induced by auxin treatment, preferentially expresses in the vascular tissue of culms and young panicles, and encodes a novel membrane-localized protein, strongly suggesting its role in regulating auxin transport. Consistent with this finding, the mutant has increased auxin basipetal transport and altered auxin distribution, whereas the knockdown plants have decreased auxin transport. Manipulation of BG1 in both rice and Arabidopsis can enhance plant biomass, seed weight, and yield. Taking these data together, we identify a novel positive regulator of auxin response and transport in a crop plant and demonstrate its role in regulating grain size, thus illuminating a new strategy to improve plant productivity.


Tiller angle, an important component of plant architecture, greatly influences the grain yield of rice (Oryza sativa L.). Here, we identified Tiller Angle Control 4 (TAC4) as a novel regulator of rice tiller angle. TAC4 encodes a plant-specific, highly conserved nuclear protein. The loss of TAC4 function leads to a significant increase in the tiller angle. TAC4 can regulate rice shoot

gravitropism by increasing the indole acetic acid content and affecting the auxin distribution. A sequence analysis revealed that TAC4 has undergone a bottleneck and become fixed in indica cultivars during domestication and improvement. Our findings facilitate an increased understanding of the regulatory mechanisms of tiller angle and also provide a potential gene resource for the improvement of rice plant architecture.