Wyniki wyszukiwania - Biblioteka Nauki

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Metody i vozmozhnosti primenenija ehlektronnykh sistem dlja povyshenija immuniteta novorozhdennykh zhivotnykh

100%

Garasymchuk I. , Potapskijj P. , Pancir Y. , Gordijjchuk I.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2015

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tom 17

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nr 5

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Responses of Physiological Characteristics of Annual C4 Herbs to Precipitation and Wind Changes in Semi-Arid Sandy Grassland, Northern China

84%

Sun S. , Liu X. , He Y. , Lv P. , Chelmeg , Zhang L. , Wei S.

Polish Journal of Ecology

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2020

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tom Vol. 68, nr 2

121--131

EN

The effects of changing precipitation and wind regimes on plant physiology are increasingly drawing attention of eco-physiologists. In the manipulative experiment we studied the physiological mechanisms of annual C4 herbs in the semi-arid sandy land to understand the functional significance of their traits and responses to the changing environment, grass Setaria viridis, characterized by the moderate stem water content and low leaf water content, more effectively absorbed light energy and utilized water resources than two dominant dicot plants, Salsola collina and Bassia dasyphylla. Precipitation increase and wind reduction promoted photosynthesis of the three C4 herbaceous plants, and their photosynthetic rates were higher in the end of July than that in August. Precipitation increase and the 20% reduction in wind velocity could also enhance their stomatal conductance and transpiration rate. The transpiration rate was consistent with the change in stomatal conductance, exhibiting highly positive correlation. The interactive effects of precipitation increase and wind velocity reduction made great changes in photosynthetic rate of the S. collina, lifted the photosynthetic rate and water use efficiency of the S. viridis. Our results suggest that the C4 herbs have shown some degree of stress resistance, and they are able to acclimate better to frangible environment of semi-arid sandy land. Furthermore, the changing environments heighten photosynthesis of the C4 herbs, which is pretty important to strength the arid plant stress resistance, then contributed to the ecosystem community production and dry matter accumulation.

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Growth characteristics of Fusarium spp. causing wilt disease in Psidium guajava L. in India

84%

Gupta V. K. , Misra A. K. , Gaur R. K.

Journal of Plant Protection Research

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2010

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tom 50

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nr 4

EN

Fusarium oxysporum f. sp. psidii and F. solani, causal agents of wilt in guava are highly variable pathogens. This study was conducted on cultural and physiological (temperature and pH) characters. The data revealed that maximum mycelial growth was obtained in potato dextrose agar as semi-solid media i.e. 78.00 mm for F. oxysporum f. sp. psidii; 73. 83 mm for F. solani, while malt extract broth as liquid broth media i.e. 1 385 mg mycelia for F. oxysporum f. sp. psidii; 1491 mg for F. solani. Maximum sporulation was recorded in oatmeal agar and mycological broth. The optimum temperature and pH for growth of both Fusarium spp. isolates was 28°C and 5.5. The isolates differed in their colony growth; mycelial mass, macro-conidia, and micro-conidia produced. These variations were characters of each of the isolates with respect to cultural and physiological characters.

PL

Fusarium oxysporum f. sp. psidii i F. solani, czynniki sprawcze więdnięcia P. guajava, są wysoce zmiennymi patogenami. Przedstawione badania wykonano w celu poznania cech kulturowych i fizjologicznych (temperatura i pH). Wyniki wykazały, że maksymalny wzrost grzybni miał miejsce na agarze ziemniaczanym z glukozą, jako na półstałej pożywce, np. wynosił 78 mm dla F. oxysporum f. sp. psidii; 73,83 mm dla F. solani, podczas gdy w półpłynnej pożywce słodowej uzyskano 1 385 mg grzybni dla Fusarium oxysporum f. sp. psidii i 1 491 mg dla F. solani. Maksymalne zarodnikowanie stwierdzono na pożywce z mąki owsianej i w półpłynnej pożywce mikologicznej. Optymalna temperatura i pH dla wzrostu obydwóch gatunków Fusarium, wynosiły 28°C i 5,5. Izolaty różniły się wzrostem kolonii, masą grzybni, makrokonidiami i mikrokonidiami. Te zróżnicowania były charakterystyczne dla każdego izolatu i dotyczyły zarówno cech kulturowych, jak i fizjologicznych.

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Seasonal patterns and environmental drivers of nirS- and nirK-encoding denitrifiers in sediments of Daya Bay, China

67%

Shi R. , Xu S. , Qi Z. , Huang H. , Liang Q.

Oceanologia

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2019

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tom 61

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nr 3

5

Influence of nano-silica and humic acid on physiological characteristics of Bermuda grass (Cynodon dactylon L.) under salinity stress

67%

Sharifiasl R. , Kafi M. , Saidi M. , Kalatejari S.

Acta Scientiarum Polonorum. Hortorum Cultus

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2019

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tom 18

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nr 4

EN

This research was conducted to evaluate the effects of water salinity and nano-silica (NS) and humic acid (HA) on Bermuda grass. The study was carried out under greenhouse and exterior space conditions in a completely randomized design with factorial arrangements. Treatments included 4 water salinity levels (0, 5, 7 and 9 dS/m) and 4 level of NS (0, 1, 2 and 3 mm/l) as well as 4 level of HA (0, 50, 100 and 150 mg/l). Results indicated a decrease in chlorophyll content, and increase in proline, malondialdehyde (MDA), catalase (CAT), superoxide dismutase (SOD) and electrolyte leakage (EL) with increasing levels of salinity. The chlorophyll content in greenhouse and exterior space also increased with increasing levels of NS and HA, while proline in two environments, with increasing levels of NS and HA decreased. EL with increasing levels of NS fluctuated, but with increasing levels of HA, it decreased in two environments. With increasing levels of NS, CAT in both environments was eventually decreased after the oscillation, but there was no particular trend in HA levels. With increasing levels of NS and HA, MDA in the greenhouse decreased and in the exterior space – it increased. Finally, by increasing levels of NS and HA, SOD did not show any change in the greenhouse condition, but in the exterior space, the SOD was decreased.

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Elevated auxin levels during the reproductive stage improve rice crop productivity and grain quality

67%

Naveed M. , Sarwar N. , Mubeen K. , Rehman U. , Farooq O. , Wasaya A. , Yasir T. A.

Acta Agrobotanica

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2024

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tom 77

7

Morphological and physiological characterization of the delta-psaL mutant of cyanobacterium Synechocystis PCC6803

67%

Klodawska K. , Kis M. , Malec P. , Kovacs L. , Gombos Z. , Strzalka K.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2013

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tom 94

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nr 3

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Effects of palm leaf biochar on the availability of soil nutrients, leaf nutrient concentration, and physiological characteristics of melon plants (Cucumis melo L.) under drought stress

67%

Bagheri S. , Hassandokht M. R. , Mirsoleimani A. , Mousavi A.

Acta Agrobotanica

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2020

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tom 73

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nr 1

9

Bakanae disease of rice in Malaysia and Indonesia: etiology of the causal agent based on morphological, physiological and pathogenicity characteristics

67%

Zainudin N. A. I. M. , Rozak A. A. , Salleh B.

Journal of Plant Protection Research

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2008

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tom 48

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nr 4

475-485

EN

Bakanae disease on rice has been recorded almost in all countries where paddy is grown commercially, especially in Asian countries, including Malaysia and Indonesia. Bakanae disease was widespread in Peninsular Malaysia and three provinces of Indonesia with the range of disease severity from scale 1 to 5 and disease incidence from 0.5 to 12.5% during 2004-2005 main growing seasons. A total of five Fusarium species belonging to section Liseola and their allied i.e. Fusarium fujikuroi, F. proliferatum, F. sacchari, F. subglutinans and F. verticillioides were isolated and identified on the basis of their morphological characteristics. Literature data showed that the bakanae disease of rice all over the world is caused by F. fujikuroi and probably some other Fusarium species from section Liseola or allied. However, from pathogenicity tests that have been carried out by using variety MR 211 of rice it was evident that F. fujikuroi was highly virulent and the only species involved in causing bakanae disease. Therefore, this species was the only one detected to be able to produce gibberellic acid - (GA3) with Rf value 0.40 and 0.62, developed in solvent systems isopropanol:ammonia:water (10: 1: 1), v/v/ v and chloroform:ethyl acetate:formic acid (5: 4: 1), v/v/v, respectively. This knowledge would be invaluable in developing our understanding on the interaction between F. fujikuroi and the host plants.

PL

Choroba bakanae występuje niemal we wszystkich rejonach uprawy ryżu, a zwłaszcza w krajach azjatyckich, takich jak Malezja czy Indonezja. W czasie głównych sezonów wegetacyjnych 2004-2005 choroba rozprzestrzeniła się na półwyspie Malezyjskim oraz w trzech prowincjach Indonezji, a jej występowanie utrzymywało się na poziomie 0,5-12,5%. Nasilenie określono w skali 1-5. Ze zgromadzonego materiału roślinnego na podstawie cech morfologicznych patogenów wyodrębniono ogółem pięć gatunków Fusarium należących do sekcji Liseola: F. fujikuroi, F. proliferatum, F. saccari, F. subglutinans, F. verticillioides. Z badań prowadzonych na świecie wynika, że choroba jest wywoływana przez F. fujikuroi oraz prawdopodobnie inne gatunki Fusarium z sekcji Liseola. Wyniki prezentowanych badań nad patogenicznością wyodrębnionych izolatów patogenu na odmianie ryżu MR 211 wykazały, że gatunek F. fujikuroi charakteryzował się silną wirulencją i był jedynym głównym sprawcą choroby bakanae ryżu. Spośród wszystkich zidentyfikowanych gatunków F. fujikuroi jako jedyny wytwarzał kwas giberelinowy - (GA3) z parametrem Rf wynoszącym 0,40 i 0,62 w warunkach doświadczeń laboratoryjnych przy zastosowaniu roztworów - izopropanol: amonika: woda (10: 1: 1), v/v/v oraz chloroform: octan etylu: kwasmrówkowy (5: 4: 1), v/v/v. Prezentowane wyniki badań stanowią cenne wzbogacenie wiedzy w zakresie interakcji pomiędzy patogenem F. fujikuroi a rośliną gospodarzem.