'Tachisuzuka', a new rice cultivar with high straw yield and high sugar content for whole-crop silage use

Abstract

'Tachisuzuka' is a new rice (Oryza sativa L.) cultivar for whole-crop silage (WCS) use. Agronomic characters were recorded from 2007 to 2009. The culm length of Tachisuzuka was 11 cm longer than that of Kusanohoshi. The short panicle of Tachisuzuka was morphologically similar to that of the short panicle 1 (sp1) mutant. Tachisuzuka exhibited high lodging resistance in the yellow ripening stage, the optimal period for harvesting, and a month after yellow ripening. The straw yield of Tachisuzuka was remarkably higher than that of Kusanohoshi but its grain yield was lower. A portion of grains are undigested and excreted in feces by cattle fed with rice WCS, and this loss of nutrients should not be disregarded. The low grain/straw ratio of Tachisuzuka indicates that the loss of nutrients in cattle fed with Tachisuzuka WCS should be lower than with Kusanohoshi WCS. Low sugar content of rice plants is considered a cause of silage deterioration. The sugar content of Tachisuzuka was markedly higher than that of Kusanohoshi.

Characterization of sugar metabolism in the stem of Tachisuzuka, a whole-crop silage rice cultivar with high sugar content in the stem

“…G6P, F6P, UDPG, ADPG, should be compared between TS and KH. Also the other parental line of TS, Gokutansui (a mutant line with extrashort panicles; Matsushita et al, 2011), would be worth for comparison. To clarify the key factor underlying sugar accumulation in rice stems, further studies such as functional analyses of candidate genes, and analyses using backcross-derived populations of TS, are required.…”

“…Tachisuzuka (TS), a rice cultivar used for whole-crop silage, has a small panicle and high sugar content in the stem (Matsushita et al, 2011). We previously showed that its small panicle is due to the mutation of the SP1 gene (Hirose et al, 2017), which belongs to the NRT1/PTR family (Léran et al, 2014;Li et al, 2009).…”

Overexpression of CO2-responsive CCT protein, a key regulator of starch synthesis strikingly increases the glucose yield from rice straw for bioethanol production

“…Biotechnology, andBiochemistry, 75, 1104-1112. rice straw after dilute acid pretreatment using these cultivars were also very high (Goda et al, 2016;Teramura et al, 2013). However, as observed in CRCT overexpression lines, the grain yield of these rice cultivars was significantly low because of their small panicles (Matsushita et al, 2011). Thus, it is considered that there should be trade-off relationship between the glucose content of rice straw and the grain yield.…”

“…These observations probably led to the reduction of grain yield in CRCT overexpression lines. Previous studies demonstrated that 'Tachisuzuka' and 'Leafstar' could accumulate high levels of carbohydrates in stems (Matsushita et al, 2011;Ookawa et al, 2010). The glucose contents in liquid hydrolyzate of hydrolyzate.…”

Yield and Lodging Resistance of ‘Tachiayaka’, a Novel Rice Cultivar with Short Panicles for Whole-Crop Silage

“…However, there is loss of the nutrients because some of the grain eaten by cattle is excreted in feces without being digested (Yamamoto et al, 2005;Fang et al, 2011). As a solution to this problem, a new rice cultivar with short panicles, 'Tachisuzuka', was developed and released (Matsushita et al, 2011). The short panicles resulted in a markedly low grain/straw ratio, and the milk yield in lactating cattle fed 'Tachisuzuka' silage increased (Kouno, 2011).…”