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1.
Ying Yong Sheng Tai Xue Bao ; 27(1): 40-8, 2016 Jan.
Artigo em Chinês | MEDLINE | ID: mdl-27228591

RESUMO

By using 77 families of 3 year-old Reaumuria soongorica seedlings that grew well without injection of any pests and diseases as experimental material, the contents of soluble protein (SP), soluble sugar (SS), proline (Pro) and chlorophyll (Chl) were measured, and their drought resistance was evaluated with principal component analysis and subordinate function method. The results showed that there were great differences in leaf osmolytes and chlorophyll among the 77 families. The soluble protein content varied from 2.14 to 8.60 mg · g⁻¹ FM, the soluble sugar content was from 6.82 to 21.86 mg · g⁻¹ FM, the proline content was from 118.73 to 1494.30 µg · g⁻¹ FM, the chlorophyll a content was from 321.88 to 897.37 µg · g⁻¹ FM, the chlorophyll b content was from 53.65 to 249.04 µg · g⁻¹ FM, chlorophyll (a+b) was from 387.39 to 1146.40 µg · g⁻¹ FM, and the chlorophyll a/b was from 3.46 to 6.42. All drought-resistant indices had significant difference among R. soongorica families, among which the proline content varied most, followed by the soluble sugar content. Evaluated by using the synthesized multi-index, it was found that 12 families showed good drought resistance, with Zhazigou 1-2 and Zhazigou 1-1 performing the best.


Assuntos
Secas , Tamaricaceae/fisiologia , Carboidratos/química , Clorofila/química , Clorofila A , Osmorregulação , Folhas de Planta/química , Prolina/química , Plântula/fisiologia
2.
Ying Yong Sheng Tai Xue Bao ; 24(1): 25-31, 2013 Jan.
Artigo em Chinês | MEDLINE | ID: mdl-23717986

RESUMO

In this study, the root systems of desert plant species Reaumuria soongorica and Nitraria tangutorum in the central Hexi Corridor of Northwest China were excavated by shovel, and the characteristics of the plant root architecture were analyzed by using topology and fractal theory. The root topological indices of the two desert plants were small, and the root branching patterns were herringbone-like. The roots of the two desert plants had obvious fractal characteristics, with the fractal dimension of R. soongorica and N. tangutorum being (1.18 +/- 0.04) and (1.36 +/- 0.06), respectively. The root fractal dimension and fractal abundance were significantly positively correlated with the root average link length. The root average link lengths of the two plants were long, which enlarged the plants' effective nutrition space, and thus, made the plants adapt to the dry and infertile soil environment. The sums of the root cross-sectional areas before and after the root bifurcation of the two desert plants were equal, which verified the principle of Leonardo da Vinci. A total of 17 parameters of root architecture were analyzed by the principal component analysis. The parameters of root topological structure, numbers of root links, stepwise branching ratio, and root diameter could well present the root architecture characteristics of the two desert plants.


Assuntos
Clima Desértico , Magnoliopsida/anatomia & histologia , Raízes de Plantas/anatomia & histologia , Árvores/anatomia & histologia , China , Ecossistema , Magnoliopsida/fisiologia , Raízes de Plantas/fisiologia , Tamaricaceae/anatomia & histologia , Tamaricaceae/fisiologia , Árvores/fisiologia
3.
Diabetes Care ; 36(7): 2038-40, 2013 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-23536582

RESUMO

OBJECTIVE: To evaluate the usefulness of a fasting plasma glucose (FPG) at 24-28 weeks' gestation to screen for gestational diabetes mellitus (GDM). RESEARCH DESIGN AND METHODS: The medical records and results of a 75-g 2-h oral glucose tolerance test (OGTT) of 24,854 pregnant women without known pre-GDM attending prenatal clinics in 15 hospitals in China were examined. RESULTS: FPG cutoff value of 5.1 mmol/L identified 3,149 (12.1%) pregnant women with GDM. FPG cutoff value of 4.4 mmol/L ruled out GDM in 15,369 (38.2%) women. With use of this cutoff point, 12.2% of patients with mild GDM will be missed. The positive predictive value is 0.322, and the negative predictive value is 0.928. CONCLUSIONS: FPG at 24-28 weeks' gestation could be used as a screening test to identify GDM patients in low-resource regions. Women with an FPG between ≥4.4 and ≤5.0 mmol/L would require a 75-g OGTT to diagnose GDM. This would help to avoid approximately one-half (50.3%) of the formal 75-g OGTTs in China.


Assuntos
Diabetes Gestacional/sangue , Jejum/sangue , Glicemia/metabolismo , China/epidemiologia , Diabetes Gestacional/epidemiologia , Feminino , Teste de Tolerância a Glucose , Humanos , Gravidez
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