Rice Blast and Bacterial Blight of Regional Trial Rice Varieties in Anhui Province: Resistance Analysis

doi:10.11924/j.issn.1000-6850.casb2021-0246

Abstract

Abstract:

The aim is to clarify the resistance to rice blast and bacterial blight of the tested varieties in Anhui Province from 2017 to 2020. The resistance of varieties to rice blast was measured by combining artificial spray inoculation and natural induction, and the resistance of varieties to bacterial blight was measured by leaf shearing method. The results showed that among the 659 rice varieties, 48.10% were moderately susceptible to rice blast, followed by moderately resistant, susceptible and highly susceptible. The resistant varieties accounted for only 1.06%, and there was no highly resistant variety. 51.59% were susceptible to rice bacterial blight, followed by moderately susceptible, moderately resistant, resistant, highly susceptible, and there was no highly resistant variety. The resistance rate of indica rice to rice blast (42.78%) was higher than that of japonica rice (17.89%), and the resistance rate of indica rice to bacterial blight (4.81%) was lower than that of japonica rice (22.81%). The resistance rate of the tested varieties to rice blast decreased year by year, and the resistance rate to bacterial blight showed a ‘decline-up-decline’ trend. The proportion of varieties resistant to both the two diseases was from 1.16% to 3.07%, which increased year by year. It can be seen that the resistance levels of the tested varieties to rice blast and bacterial blight were general, and there were differences in disease resistance between indica rice and japonica rice, and the disease resistance rate varied greatly from year to year.

Key words: rice blast, bacterial blight, resistance, Anhui Province, regional trial

CLC Number:

S435.111.4

CHEN Qingqing, WANG Chunlin, ZHANG Haishan, ZHANG Aifang. Rice Blast and Bacterial Blight of Regional Trial Rice Varieties in Anhui Province: Resistance Analysis[J]. Chinese Agricultural Science Bulletin, 2022, 38(3): 134-139.

Figures/Tables 7

References 29

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病级	综合指数	抗性水平
0	<0.1	高抗(HR)
1	0.1~2.0	抗病(R)
3	2.1~4.0	中抗(MR)
5	4.1~6.0	中感(MS)
7	6.1~7.5	感病(S)
9	7.6~9.0	高感(HS)

病级	综合指数	抗性水平
0	<0.1	高抗(HR)
1	0.1~2.0	抗病(R)
3	2.1~4.0	中抗(MR)
5	4.1~6.0	中感(MS)
7	6.1~7.5	感病(S)
9	7.6~9.0	高感(HS)

病级	发病情况	抗性水平
0	剪口无病斑	高抗(HR)
1	剪口有小病斑,长度不超过2 cm	抗(R)
3	病斑向下扩展2 cm以上,不超过剩余叶长的1/4	中抗(MR)
5	病斑占剩余叶面积的1/4~1/2	中感(MS)
7	病斑占剩余叶面积的1/2~3/4	感(S)
9	病斑超过剩余叶面积的3/4	高感(HS)

病级	发病情况	抗性水平
0	剪口无病斑	高抗(HR)
1	剪口有小病斑,长度不超过2 cm	抗(R)
3	病斑向下扩展2 cm以上,不超过剩余叶长的1/4	中抗(MR)
5	病斑占剩余叶面积的1/4~1/2	中感(MS)
7	病斑占剩余叶面积的1/2~3/4	感(S)
9	病斑超过剩余叶面积的3/4	高感(HS)

品种	抗	中抗	中感	感	高感	抗病率/%
籼稻	3	157	167	46	1	42.78
粳稻	4	47	150	77	7	17.89
总	7	204	317	123	8	32.02