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Seedling and adult plant resistance to leaf rust in 46 Chinese bread wheat landraces and 39 wheat lines with known
Lr
genes
ZHANG Pei-pei, Takele Weldu Gebrewahid, ZHOU Yue, LI Qing-luo, LI Zai-feng, LIU Da-qun
2019, 18 (
5
): 1014-1023. DOI:
10.1016/S2095-3119(19)62575-X
Abstract
(
204
)
PDF in ScienceDirect
Wheat leaf rust, caused by
Puccinia triticina
(Pt), is an important foliar disease that has an important influence on wheat yield. The most economic, safe and effective way to control the disease is growing resistant cultivars. In the present study, a total of 46 wheat landraces and 34 wheat lines with known
Lr
(leaf rust resistance) genes were inoculated with 16 Pt pathotypes for postulating seedling resistance gene(s) in the greenhouse. These cultivars and five wheat differential lines with adult plant resistance (APR) genes (
Lr12
,
Lr22b
,
Lr34
,
Lr35
and
Lr37
) were also evaluated for identification of slow rusting resistance in the field trials in Baoding, Hebei Province of China in the 2014–2015 and 2015–2016 cropping seasons. Furthermore, 10 functional molecular markers closely linked to 10 known
Lr
genes were used to detect all the wheat genotypes. Results showed that most of the landraces were susceptible to most of the Pt pathotypes at seedling stage. Nonetheless,
Lr1
was detected only in Hongtangliangmai. The field experimental test of the two environments showed that 38 landraces showed slow rusting resistance. Seven cultivars possessed
Lr34
but none of the landraces contained
Lr37
and
Lr46
.
Lr
genes namely,
Lr9
,
Lr19
,
Lr24
,
Lr28
,
Lr29
,
Lr47
,
Lr51
and
Lr53
were effective at the whole plant stage.
Lr18
,
Lr36
and
Lr45
had lost resistance to part of pathotypes at the seedling stage but showed high resistance at the adult plant stage.
Lr34
as a slowing rusting gene showed good resistance in the field. Four race-specific APR genes
Lr12
,
Lr13
,
Lr35
and
Lr37
conferred good resistance in the field experiments. Seven race-specific genes,
Lr2b
,
Lr2c
,
Lr11
,
Lr16
, Lr26,
Lr33
and
LrB
had lost resistance. The 38 landraces showed slow rusting resistance to wheat leaf rust can be used as resistance resources for wheat resistance breeding in China.
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Modelling and mapping soil erosion potential in China
TENG Hong-fen, HU Jie, ZHOU Yue, ZHOU Lian-qing, SHI Zhou
2019, 18 (
2
): 251-264. DOI:
10.1016/S2095-3119(18)62045-3
Abstract
(
327
)
PDF
(22325KB)(
256
)
Soil erosion is an important environmental threat in China. However, quantitative estimates of soil erosion in China have rarely been reported in the literature. In this study, soil loss potential in China was estimated by integrating satellite images, field samples, and ground observations based on the Revised Universal Soil Loss Equation (RUSLE). The rainfall erosivity factor was estimated from merged rainfall data using Collocated CoKriging (ColCOK) and downscaled by geographically weighted regression (GWR). The Random Forest (RF) regression approach was used as a tool for understanding and predicting the relationship between the soil erodibility factor and a set of environment factors. Our results show that the average erosion rate in China is 1.44 t ha
–1
yr
–1
. More than 60% of the territory in China is influenced by soil erosion limitedly, with an average potential erosion rate less than 0.1 t ha
–1
yr
–1
. Other unused land and other forested woodlands showed the highest erosion risk. Our estimates are comparable to those of runoff plot studies. Our results provide a useful tool for soil loss assessments and ecological environment protections.
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Mapping of QTL conferring leaf rust resistance in Chinese wheat lines W014204 and Fuyu 3 at adult plant stage
QI Ai-yong, ZHANG Pei-pei, ZHOU Yue, YAO Zhan-jun, LI Zai-feng, LIU Da-qun
2016, 15 (
1
): 18-28. DOI:
10.1016/S2095-3119(14)60974-6
Abstract
(
1900
)
PDF in ScienceDirect
Wheat leaf rust is a destructive foliar disease of common wheat (Triticum aestivum L.) worldwide. The most effective, economical s to control the disease is growing resistant cultivars with adult plant resistance (APR). The Chinese wheat lines W014204 and Fuyu 3 showed high leaf rust resistance in the field. To identify leaf rust APR genes in the two lines, two mapping populations with 215 and 163 F2:3 lines from the crosses W014204/Zhengzhou 5389 and Fuyu 3/Zhengzhou 5389, respectively, were phenotyped for leaf rust severities during the 2010–2011, 2011–2012 and 2012–2013 cropping seasons in the field at Baoding, Hebei Province, China. A total of 1 215 SSR markers were used to identify the quantitative trait loci (QTLs) for leaf rust APR in the two populations. In the W014204/Zhengzhou 5389 population, three QTLs were detected and designated as QLr.hbu-1BL.1, QLr.hbu-2BS.1 and QLr.hbu-7DS, and explained 2.9–8.4, 11.5–38.3 and 8.5–44.5% of the phenotypic variance, respectively; all the resistance alleles at these loci were derived from W014204. In the Fuyu 3/Zhengzhou 5389 population, three QTLs, QLr.hbu-1BL.2, QLr.hbu-2BS.2 and QLr.hbu-7BL, explained 12.0–19.2, 22.3–38.9 and 4.1–4.3% of the phenotypic variance, respectively, and all resistance alleles were contributed by Fuyu 3. Based on chromosome positions of closely linked markers, both QLr.hbu-1BL.1 and QLr.hbu-1BL.2 are Lr46, and QLr.hbu-7DS is Lr34. QLr.hbu-7BL was mapped on chromosome 7BL near to Lr68 and they are likely the same gene. Based on chromosome positions, pedigree and field reactions, the two 2BS QTLs are different from all the known APR genes and are likely to be new APR QTL for leaf rust. These QTLs and their closely linked markers are potentially useful for improving leaf rust resistance in wheat breeding.
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