作者机构：
[Xudong Zhu; Ju Zhao; Ziliang Zhu; Dan Zhu; Qingming Zhou] College of Agronomy, Hunan Agricultural University, Changsha, China;[Xieli Tong] Agricultural and Rural Bureau, Hengshan County, Hengyang, China
关键词：
Indica;and;Japonica;Subspecies;HETEROSIS;Cheng’s;Index;Euclidean;Distance;Indica and Japonica Subspecies;Heterosis;Cheng’s Index;Euclidean Distance
摘要：
Exploring the indica-japonica differentiation in parents of hybridization can provide theoretical bases for utilizing inter-subspecific heterosis. In this study, 5 sterile lines and 18 self-bred restorer lines were used as female parents and male parents respectively. T...MORE Exploring the indica-japonica differentiation in parents of hybridization can provide theoretical bases for utilizing inter-subspecific heterosis. In this study, 5 sterile lines and 18 self-bred restorer lines were used as female parents and male parents respectively. Then 90 combinations were constructed by incomplete diallel cross followed by relationship analysis between parental Cheng’s index difference value and Euclidean distance and heterosis. The results showed a significant correlation between several phenotype values, super male parent heterosis and control heterosis and Euclidean distance or Cheng’s index difference value. However, it was no significant correlation for yield. Further analysis found a common interval, 3.41 - 3.46 for Euclidean distance and 3 - 4 for cheng’s index difference value of parents, which was significant or high significant positive correlated with phenotype value, super male parent and control heterosis of main yield traits. This illustrates that the larger the genetic difference of parents was, the stronger the heterosis combinations were, when the genetic differences of parents were in an appropriate range.FEWER
作者：
Cai, X. H.;Chen, T.;Wang, R. Y.;Fan, Y. J.;Li, Y.;...
期刊：
Theoretical and Applied Climatology,2019年137(3-4):2139-2149 ISSN：0177-798X
通讯作者：
Zhou, W.;Zhou, Q. M.
作者机构：
[Wang, R. Y.; Fan, Y. J.; Hu, S. N.; Yuan, Z. M.; Li, Y.; Cai, X. H.; Zhou, W.] Hunan Agr Univ, Hunan Prov Engn & Technol Res Ctr Agr Big Data An, Changsha 410128, Hunan, Peoples R China.;[Wang, R. Y.; Fan, Y. J.; Hu, S. N.; Yuan, Z. M.; Li, Y.; Cai, X. H.; Zhou, W.] Hunan Agr Univ, Hunan Prov Key Lab Biol & Control Plant Dis & Ins, Changsha 410128, Hunan, Peoples R China.;[Wang, R. Y.; Fan, Y. J.; Hu, S. N.; Yuan, Z. M.; Li, Y.; Cai, X. H.; Zhou, W.] Hunan Agr Univ, Hunan Prov Engn & Technol Res Ctr Biopesticide &, Changsha 410128, Hunan, Peoples R China.;[Zhou, Q. M.; Chen, T.] Hunan Agr Univ, Coll Agr, Changsha 410128, Hunan, Peoples R China.;[Li, H. G.; Li, X. Y.] Hunan Tobacco Co, Chenzhou Co, Chenzhou 423000, Peoples R China.
通讯机构：
[Zhou, W.; Zhou, Q. M.] H;[Zhou, W.] T;Hunan Agr Univ, Hunan Prov Engn & Technol Res Ctr Agr Big Data An, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Hunan Prov Key Lab Biol & Control Plant Dis & Ins, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Hunan Prov Engn & Technol Res Ctr Biopesticide &, Changsha 410128, Hunan, Peoples R China.
摘要：
Tobacco wildfire disease is common globally, and climate change may increase the risk of outbreaks. Therefore, there is an urgent need to establish an effective climate model to forecast the occurrence of wildfire disease. To design such a model, we collected data for 40 wildfire disease indices via tobacco field surveys and data for 15 climate factors of Guiyang County in China from 2012 to 2016. First, we built multiple linear regression (MLR), stepwise linear regression (SLR) and support vector regression (SVR) models using three climate features (precipitation, mean daily temperature and sunshine duration), and we could not find an effective model. Second, we built three corresponding models using expanded 15 climate features and an in-house WDEM method (the worst descriptor elimination multi-roundly), and the independent test results showed that the best SVR model had not only a higher predictive accuracy (
$$ {Q}_{ext}^2 $$
= 0.94) but also a better stability. Finally, we further evaluated the biological significance of their retained climate features and the single-factor effects of the best model according to the interpretability analysis, and our results indicated that (1) the three climate factors (minimum value of wind velocity, daily range of temperature and daily pressure) strongly affected the occurrence of wildfire disease; (2) the ranges of relative humidity and sunshine hours were negatively correlated with the occurrence of wildfire disease, while daily mean vapour pressure was positively correlated with the occurrence of the disease. Our work enables a useful theoretical prediction for wildfire disease, especially in terms of climate-related predictions.
关键词：
captation du plomb;croissance racinaire;endophytes;lead uptake;root growth
摘要：
Endophytic bacteria are generally helpful for plant growth and protection. We isolated from tobacco seeds three Pseudomonas strains (K03, Y04, and N05) that could produce siderophores, indole-3-acetic acid, and 1-aminocyclopropane-1-carboxylate deaminase, fix nitrogen, dissolve phosphorus and potassium, and tolerate heavy metals. In pot experiments, the three isolated strains significantly promoted root growth and increased the root enzyme activity in Nicotiana tobacum K326. Furthermore, bacterial inoculations increased the proportion of residual lead (Pb) by 8.36%-51.63% and decreased the total Pb content by 3.28%-6.38% in the contaminated soil during tobacco planting, compared with uninoculated soils. An effective decrease in Pb content was also found in tobacco leaves with bacterial inoculations. K03 inoculation decreased the Pb content in the upper leaves by 49.80%, and Y04 inoculation had the best effect, decreasing the Pb content in the middle leaves by 70.12%. Additionally, soil pH and root activity had significant effects on transformation and translocation of Pb. The study suggested that in response to Pb pollution in soil, a reasonable application of endophytes (e.g., Pseudomonas) might be a promising approach in promoting tobacco growth and reducing Pb content in tobacco, while simultaneously enhancing Pb stabilization in soils.
摘要：
Understanding the genetic control of mineral element contents in the last three leaves of hybrid rice will shed light on breeding hybrid rice with ideal mineral element contents. In this study, 25 hybrid rice combinations were created using five elite male sterile lines and five restorer lines. The combining ability of potassium (K), calcium (Ca), iron (Fe), copper (Cu), magnesium (Mg), manganese (Mn), phosphorus (P), sulfur (S) and zinc (Zn) in the last three leaves of these crosses were analyzed at both active tillering stage and milky stage. The results showed that the variance of the general combining ability (GCA) of these parents was larger than the variance of the specific combining ability (SCA) of all crosses. Moreover, larger variation range of heterosis was found in the lines crossed from the parents with the larger variance of SCA. The restorer lines exhibited stronger heritability than sterile lines for Ca, Cu, Mn, S, Zn at active tillering stage and for K, Ca, S, Zn at milky stage. The further phenotypic evaluation for tested crosses revealed that the content of some mineral elements in the last three leaves showed positively significant correlation with yield-related traits. Selecting parents with higher GCA and larger variance of SCA will help us develop the hybrid combination with ideal content of mineral elements and good yield performance for the future hybrid rice breeding program. (C) 2018 Friends Science Publishers
