2009
DOI: 10.1590/s1677-04202009000400007
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Changes in growth and photosynthetic capacity of cucumber seedlings in response to nitrate stress

Abstract: The effects of three nitrate levels -14(CK), 56(T-1), and 140 mmol L -1 (T-2) -on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated. The results showed that at 12 d after treatment plant height, stem diameter, leaf area, and leaf number of cucumber seedlings were stimulated by 56 mmol L -1 nitrate, whereas were inhibited significantly by 140 mmol L -1 nitrate compared with CK. Short-term stimulation in photosynthetic rate … Show more

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Cited by 19 publications
(14 citation statements)
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References 42 publications
(33 reference statements)
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“…However, the content of chl b, which belongs to secondary pigments and is found exclusively in the pigment antenna system (Lichtenthaler and Buschmann, 2001), remained at the control level in the lupin seedlings. Environmental factors severely affect not only the photosynthetic pigment content but also the chlorophyll a/b (R a / b ) and chlorophyll/carotenoid (chl a + b/car) ratio (Yang et al, 2009). In the present study, 130-mT MFS resulted in an increase in R a / b and a decrease in the chl a + b/car ratio.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…However, the content of chl b, which belongs to secondary pigments and is found exclusively in the pigment antenna system (Lichtenthaler and Buschmann, 2001), remained at the control level in the lupin seedlings. Environmental factors severely affect not only the photosynthetic pigment content but also the chlorophyll a/b (R a / b ) and chlorophyll/carotenoid (chl a + b/car) ratio (Yang et al, 2009). In the present study, 130-mT MFS resulted in an increase in R a / b and a decrease in the chl a + b/car ratio.…”
Section: Discussionmentioning
confidence: 99%
“…On the other hand, 100-mT magnetic field exposure decreased the value of R a / b by approximately 4% in maize plants (Răcuciu et al, 2008). The increase in chlorophyll a/b is possibly due to the lesser sensitivity of chl a compared to chl b (Yang et al, 2009). The ratio of chl a + b to total car (chl a + b/ car) is an indicator of the greenness of plants and normally lies between 4.2 and 5 in sunned leaves and between 5.5 and 7.0 in shaded leaves (Lichtenthaler and Buschmann, 2001).…”
Section: Discussionmentioning
confidence: 99%
“…Photosynthetic pigment content plays a critical role in photosynthesis. The amount of chlorophylls has a close correlation with photosynthetic capacity of plants [22]. The chlorophyll meter (or SPAD meter) is a simple, portable diagnostic tool for nondestructive estimation of leaf chlorophyll content [23].…”
Section: Resultsmentioning
confidence: 99%
“…hysterophoruswere processed to isolate chloroplastsin 0.05 M Tris-HCl buffer, with pH7.6, consisting of 0.4 M sucrose along with 0.01 M NaCl as described by Yang et al 63 with some slight modification. Extraction buffer was used twice to wash the chloroplasts and eventuallythe chloroplasts were suspended in the extraction buffer.…”
Section: Ultrastructure Of Chloroplast and Mitochondria Ultrastructumentioning
confidence: 99%