scholarly journals Machine learning in determination of water saturation deficit in wheat leaves on basis of Chl a fluorescence parameters

2019 ◽  
Vol 57 (1) ◽  
pp. 226-230
Author(s):  
K. RYBKA ◽  
M. JANASZEK-MANKOWSKA ◽  
P. SIEDLARZ ◽  
D. MANKOWSKI
Keyword(s):  
Machine Learning ◽  
Water Saturation ◽  
Water Saturation Deficit ◽  
Saturation Deficit ◽  
Chl A ◽  
Fluorescence Parameters ◽  
Chl A Fluorescence ◽  
Wheat Leaves

scholarly journals CELL DAMAGE, WATER STATUS AND GAS EXCHANGES IN CASTOR BEAN AS AFFECTED BY CATIONIC COMPOSITION OF WATER

2019 ◽  
Vol 32 (2) ◽  
pp. 482-492
Author(s):  
GEOVANI SOARES DE LIMA ◽  
HANS RAJ GHEYI ◽  
REGINALDO GOMES NOBRE ◽  
LAURIANE ALMEIDA DOS ANJOS SOARES ◽  
JOÃO BATISTA DOS SANTOS
Keyword(s):  
Salt Stress ◽  
Irrigation Water ◽  
Castor Bean ◽  
Water Saturation ◽  
Water Status ◽  
Water Saturation Deficit ◽  
Gas Exchanges ◽  
Saturation Deficit ◽  
Cationic Composition ◽  
Bean Plants

ABSTRACT Castor bean is an oilseed crop which is able to adapt to various edaphoclimatic conditions and has considerable contents of oil in its seeds, with potential for use in the castor oil industry. In this context, this study aimed to evaluate changes in membrane damage, water status and gas exchanges in castor bean plants (cv. ‘BRS Energia’) in response to irrigation water salinity and cationic composition. Randomized blocks were used to test six cationic compositions (S1 - Control; S2 - Na+; S3 - Ca2+; S4 - Na+ + Ca2+; S5 - K+ and S6 - Na+ + Ca2+ + Mg2+), in four replicates. Plants in the control treatment were subjected to irrigation using water of low electrical conductivity (S1 - ECw = 0.6 dS m-1), whereas those in the other treatments were irrigated using 4.5 dS m-1 water prepared with different cations. Higher leaf succulence associated with lower water saturation deficit is an indication of tolerance to salt stress in castor bean plants irrigated with K+-rich water. The presence of Na+ in irrigation water caused the highest water saturation deficit in castor bean leaf blades. The lowest damage in cell membranes was observed in plants irrigated with Ca2+-rich water. The damaging effect of salt stress on castor bean gas exchanges depends on the cationic composition of water and occurred in the following order: Na+>Na++Ca2+>Ca2+> Na++Ca2++Mg2+>K+.

Duststorm-Facilitated Improvement of the Photosynthetic Efficiency of Tamarix ramosissima L. in the Oasis-Desert Ecotone, Northwest China

2012 ◽  
Vol 518-523 ◽  
pp. 5035-5039
Author(s):  
Wei Han ◽  
Ling Cao ◽  
Haimid Yimit
Keyword(s):  
Photosynthetic Efficiency ◽  
Weather Conditions ◽  
Northwest China ◽  
Tamarix Ramosissima ◽  
Taklimakan Desert ◽  
Chl A ◽  
Fluorescence Parameters ◽  
Mature Leaves ◽  
Chl A Fluorescence ◽  
Maximum Period

The photosynthetic efficiency of Tamarix ramosissima Ledeb., one of the major natural plants in the southern oasis-desert ecotone of the Taklimakan Desert, was investigated to assess the ecological effects of duststorms on T ramosissima Ledeb. We measured daily chlorophyll a (Chl a) fluorescence parameters of mature leaves of healthy 10-years old T. ramosissima L. during months of July and August in 2008, using a portable modulated Chl a fluorometer PAM-2100 and three duststorm days were singled out to assess the affects of duststorms on the photosynthetic efficiency. Our results showed that duststorms increased the energy absorption and the increased absorption then enhanced the photosynthetic efficiency of T. ramosissima L. under duststorm weather conditions. Our results also showed that the qP (quenching coefficients for photosynthesis) was significantly decreased and qN (quenching coefficients for non-photosynthesis) was significantly increased during the maximum period of solar readiation between 14:00 and 16:00 under normal conditions, implying that stress might occur in normal weather conditions, but lowered stress to T ramosissima Ledeb. during duststorm weather conditions. In a word, duststorm-facilitated might provide favorable opportunities for constructing and expansing oasis-desert ecotone.

scholarly journals The effect of water saturation deficit on the volume of intercellular space in laeves

2015 ◽  
Vol 43 (4) ◽  
pp. 465-470 ◽  
Author(s):  
J. Czerski ◽  
A. Sosińska ◽  
Z. Kozłowska
Keyword(s):  
Nicotiana Tabacum ◽  
Vicia Faba ◽  
Beta Vulgaris ◽  
Plant Species ◽  
Intercellular Space ◽  
Water Saturation ◽  
Intercellular Spaces ◽  
Water Saturation Deficit ◽  
Saturation Deficit ◽  
Helichrysum Bracteatum

The volume of intercellular spaces in leaves at various stages of water saturation was determined by method of Czerski (1964, 1968). The investigation were performed with the following plant species: <i>Vicia faba</i> L., <i>Nicotiana tabacum</i> L. var. <i>rustica, Solarium tuberosum</i> L. var. Flisak, <i>Helichrysum bracteatum</i> Wild., <i>Bmssica napus</i> L. var. <i>oleifera, Beta vulgaris</i> L. var. <i>saccharifera</i>.

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