Bulletin of The Iwate Agricultural Research Center No.16
Summary

Breeding of a New Rice Variety “Ginganoshizuku”
Takuma KODATE, Hiromi SUGAWARA, Tsutomu SASAKI, Yuki OHTA, Akira ABE, Masato TAKAKUSAGI, Sanae ABE(KAWADAI) and Yutaka KIUCHI
  A new paddy rice variety “Ginganoshizuku” was developed by Iwate Agricultural Research Center in 2014. This variety was selected from a cross between “Ouu 400” and “Hokuriku 208” conducted in 2006. This variety was intended as a good eating quality variety with cold tolerance at the booting stage, panicle blast resistance.
 “Ginganoshizuku” has been tested as a local line number “Iwate 107” since 2012. It was adopted as a recommended rice variety of Iwate Prefecture in 2015.
 Characteristics of “Ginganoshizuku” are as follows:
(1) It belongs to the medium-maturity group at Iwate, maturing concurrent with “Donpishari” and slightly later than “Akitakomachi”.
(2) The plants are a partial panicle-weight type. The culm length is shorter than both “Akitakomachi” and “Donpishari”, and panicle number is slightly less than “Akitakomachi” and equal to “Donpishari”.
(3) It has high tolerance to sterility caused by low temperatures at the booting stage, superior to “Akitakomachi”.
(4) It has a true blast resistance gene “Pia,Pii,Pik”. Field resistance to leaf blast is slightly strong and medium, and panicle blast is slightly strong. It has quantitative evaluation of protective effect of “Pb1”Gene.
(5) The grain yield is higher than that of “Akitakomachi”.
(6) The quality of brown rice is equal to that of “Akitakomachi” and “Donpishari”.
(7) The eating quality is excellent and equal to that of “Akitakomachi” and “Hitomebore”.
Breeding of a New Rice Variety with Early Maturity and Low Amylose Content “Kiraho”
Shinsuke NAKAJO, Tsutomu SASAKI, Hiromi SUGAWARA, Sanae ABE(KAWADAI), Yutaka KIUCHI, Kazuhiko TAMURA, Hiroko SHISHIDO, Masato TAKAKUSAGI, Akira ABE, Aya ENDO and Yoshinori KAMIYAMA
 “Kiraho” is a new rice variety with early maturity and low amylose content. It was developed at Iwate Agricultural Research Center in 2011. This variety was selected from the cross between “Milkey Princess” and “Iwate61”.
 “Kiraho” has been tested as local line number “Iwate91” since 2008. It was officially registered by Ministry of Agriculture, Forestry and Fisheries of Japan in 2013 (registration no. 24582).
 Characteristice of “Kiraho” are as follows:
(1) “Kiraho” has low amylose content endosperm. Its amylose content varies between 9 and 12 % under the weather condition in Iwate prefecture. Its variation range is smaller than that of other low amylose content rice in Iwate prefecture.
(2) It belongs to the early-maturity group in Iwate, concurrent with “Iwatekko”.
(3) It has high tolerance to sterility caused by low temperatures at booting stage.
(4) It has slightly high lodging resistance.
(5) It seems to possess one true resistance gene “Pii”for blast diseases. It has slightly high field resistance to leaf blast and high to panicle blast. Furthermore, it has field resistant gene “Pb1” which shows highly resistance to panicle blast disease.
(6) Its yielding ability is about 9% less than that of “Iwatekko”.
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