Leaf Senescence-induced Alterations in Structure and Function of Higher Plant Chloroplasts

Grover, Anil; Mohanty, Prasanna

doi:10.1007/978-94-011-2708-0_9

Cited by 27 publications

(19 citation statements)

References 112 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 1 shows a pronounced degradation of chlorophylls and carotenoids in leaf discs of Raphanus sativus. Chlorophyll breakdown is the most typical symptom of leaf senescence (Grover and Mohanty 1993;Smart 1994). In the present study comparison of chl a and chl b values revealed much higher breakdown of the former than the latter at 2-day but the reverse trend was seen in most of the cases when leaf discs were analysed after 4 and 6-day ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Role of kinetin and a morphactin in leaf disc senescence of Raphanus sativus L. under low light

Seema

Khokhar

Mukherjee

2011

Physiol Mol Biol Plants

View full text Add to dashboard Cite

The effects of exogenous application of plant growth regulators (PGRs) like kinetin and a morphactin were investigated in leaf discs obtained from detached senescent Raphanus sativus L. Chetki long leaves under continuous light with fluorescent tube of 8.12 μmol photon m(-2) s(-1) PFD. Senescence induced changes were characterized by a gradual breakdown of chlorophylls, carotenoids and protein whereas, POD (peroxidase) and protease activity; and total sugars revealed an increment. Application of kinetin (KN) and a morphactin (MOR; chlorflurenol methyl ester-CME 74050) found to be effective in senescence delay, by minimizing breakdown of chlorophylls and carotenoids; and by bringing down peroxidase and protease activity, and sugar accumulation. Although both PGR's were able to minimize senescence, their higher concentration found to be more effective than the lower one.

show abstract

Section: Resultsmentioning

confidence: 99%

Role of kinetin and a morphactin in leaf disc senescence of Raphanus sativus L. under low light

Seema

Khokhar

Mukherjee

2011

Physiol Mol Biol Plants

View full text Add to dashboard Cite

show abstract

“…Therefore, improving the photosynthetic competence of the flag leaf could play a potentially significant role in increasing wheat yield. Leaf senescence, accompanying loss of photosynthetic competence and mainly caused by decreased photosystem II (PSII) activity (Humbeck et al 1996), severely affects grain development and decreases wheat yield (Grover and Mohanty 1992). Both the integrity and photosynthetic ability of PSII are related to the content of reactive oxygen species (ROS), including H 2 O 2 , a signaling molecule that promotes leaf senescence (Hung and Kao 2003;Lin and Kao 1998;Mondal and Choudhuri 1981;Neill et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Physiological characterization of ‘stay green’ wheat cultivars during the grain filling stage under field growing conditions

Chen

Liang

et al. 2010

Acta Physiol Plant

View full text Add to dashboard Cite

Rye (Secale cereale L.) chromosome arm 1RS could delay leaf senescence, and change in H 2 O 2 content is a useful index for weighing the ability to delay the senescence. Two wheat cultivars, Chuannong12 (CN12) and Chuannong 18 (CN18), harboring the wheat-rye 1BL/1RS translocated chromosome were investigated for H 2 O 2 change and physiological index after flowering under field conditions, and MY11, the agronomical parent of both CN12 and CN18, was used as the control. A combined change in the peak value of CdSe/ZnS quantum dot (QD) fluorescence and morphological observation indicated that the H 2 O 2 contents in CN12 and CN18 were generally lower than that in MY11. They both had higher values for net photosynthetic rate (P n ), stomatal conductance (G s ), F v =F 0 m F 0 v =F 0 m , and photochemical quenching of PSII (qP) than MY11 only in the late measurement stage. Some small differences were also observed, such as CN12 and CN18 wheat cultivars having higher and longer photosynthetic competence than MY11 during the grain filling stage, which perhaps resulted from a mechanism for removing oxidative species, especially H 2 O 2 .

show abstract

“…N is clearly reduced during senescence (Lee et al 2003), when these leaves act as source of nutrients including N, and chlorophyll is destroyed. Senescence is also characterized by a decrease in photosynthesis, as that reported for this species, which is attributed to a degradation of both structural and functional components of the chloroplasts (Grove and Mohanty 1992;Whoolhouse 1984).…”

Section: Discussionmentioning

confidence: 88%

Ozone effects on three Sambucus species

Cano¹,

Calatayud²,

Cerveró³

et al. 2007

Environ Monit Assess

View full text Add to dashboard Cite

The onset and development of symptoms of three Sambucus species, S. ebulus, S. nigra and S. racemosa were studied in 2002 under three different experimental conditions, in charcoal filtered air (CF), and in two ozone enriched treatment: non filtered air plus 40 ppb ozone (NF+), and non filtered air plus 70 ppb ozone (NF++). The herb S. ebulus was more sensitive than the shrubs S. racemosa and S. nigra. Some plants of the three species showed visible injury below the AOT40 threshold of 10,000 ppb.h, established for protection of vegetation. Ozone produced a decrease in chlorophyll content in S. ebulus, and impaired both stomatal conductance and net photosynthesis in S. ebulus and S. nigra. A complementary study in 2004 with S. ebulus, confirmed a decrease in chlorophyll content after fumigation, associated to a decrease in N content of the leaves. Since S. ebulus is a widespread species in Europe and it is very sensitive to ozone, it could be a very appropriate plant for the biomonitoring studies across large areas in this continent.

show abstract

Leaf Senescence-induced Alterations in Structure and Function of Higher Plant Chloroplasts

Cited by 27 publications

References 112 publications

Role of kinetin and a morphactin in leaf disc senescence of Raphanus sativus L. under low light

Role of kinetin and a morphactin in leaf disc senescence of Raphanus sativus L. under low light

Physiological characterization of ‘stay green’ wheat cultivars during the grain filling stage under field growing conditions

Ozone effects on three Sambucus species

Contact Info

Product

Resources

About