Heat-induced changes in dry weight, leaf size and number of chloroplasts per cell in maize and cowpea shoots

Adelusi, S.A.; Lawanson, A. O.

doi:10.1017/s002185960004644x

Cited by 7 publications

(5 citation statements)

References 11 publications

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“…Chill injury, for example, may not lead directly to chlorophyll breakdown until the later invasion of degradative micro-organisms. Other climatic influences recognized as directly or indirectly involved in chlorophyll destruction include excessive or prolonged heat (Adelusi & Lawanson, 1978), cold (Taylor & Craig, 1971), u.v. and y-radiation (Krebs, 1965;Sisson & Caldwell, 1976;Murai, 1980), high irradiance by visible light combined with low temperatures, as in chill-induced photobleaching (Oquist et al, 1978), or even darkness.…”

Section: Conditions In Which Chlorophyll Destruction Occursmentioning

confidence: 99%

The Degradation of Chlorophyll — A Biological Enigma

1987

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Summary Some 109tonnes of chlorophyll are destroyed each year on land and in the oceans. The fate of these chlorophylls is, however, largely unknown. This review describes the developmental stages at which chlorophyll breakdown occurs in aquatic and terrestrial biological systems, and the destruction arising from herbivory, disease, pollution and other physical hazards. At the cellular level, an attempt is made to separate the breakdown of chlorophyll during senescence from the many other events associated with cell destruction and death. A consideration of the more important chemical and biophysical properties of chlorophylls and their derivatives is provided, together with data on their spectral properties. The biosynthetic and biodegradative pathways of chlorophyll metabolism are, so far as is possible, described with some predictions as to the likely fate of the missing tonnes. Two types of degradation are recognized; the first involves up to five defined enzymes concerned with the early stages, the second covers the less well defined enzymic and non‐enzymic destruction of the macrocyclic structure. These degradative reactions are compared with the reactions implicated in the breakdown of other porphyrins including haems in plants and animals. A brief description is given of the occurrence of breakdown products of chlorophyll in past biomass, including those of geological significance and those in a more recent archaeological context. Finally, the economic significance of chlorophyll breakdown is considered in the context of agriculture and horticulture, veterinary and medical sciences, food colouring and cosmetic industries, and the multi‐million‐dollar attraction of autumn leaf fall to tourism.

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Section: Conditions In Which Chlorophyll Destruction Occursmentioning

confidence: 99%

The Degradation of Chlorophyll — A Biological Enigma

1987

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“…Leaf elongation is sensitive to environmental factors and is inhibited by abiotic stresses, including heat stress [32]. The optimal temperature for leaf development in cool-season grasses is 18–24 °C, but air temperature in the summer often exceeds this optimal temperature range, thereby restricting leaf growth [33,34].…”

Section: Introductionmentioning

confidence: 99%

Strigolactones Promote Leaf Elongation in Tall Fescue through Upregulation of Cell Cycle Genes and Downregulation of Auxin Transport Genes in Tall Fescue under Different Temperature Regimes

Zhang

Huang

2019

IJMS

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Strigolactones (SLs) have recently been shown to play roles in modulating plant architecture and improving plant tolerance to multiple stresses, but the underlying mechanisms for SLs regulating leaf elongation and the influence by air temperature are still unknown. This study aimed to investigate the effects of SLs on leaf elongation in tall fescue (Festuca arundinacea, cv. ‘Kentucky-31′) under different temperature regimes, and to determine the interactions of SLs and auxin in the regulation of leaf growth. Tall fescue plants were treated with GR24 (synthetic analog of SLs), naphthaleneacetic acid (NAA, synthetic analog), or N-1-naphthylphthalamic acid (NPA, auxin transport inhibitor) (individually and combined) under normal temperature (22/18 °C) and high-temperature conditions (35/30 °C) in controlled-environment growth chambers. Exogenous application of GR24 stimulated leaf elongation and mitigated the heat inhibition of leaf growth in tall fescue. GR24-induced leaf elongation was associated with an increase in cell numbers, upregulated expression of cell-cycle-related genes, and downregulated expression of auxin transport-related genes in elongating leaves. The results suggest that SLs enhance leaf elongation by stimulating cell division and interference with auxin transport in tall fescue.

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“…This shows the tolerance level of C. papaya to heat stress since the expectation is that a longer duration should cause a higher level of reduction in the parameters mentioned. The early reduction in fresh and dry weight of the plants in all the treatments was expected as plants are known to show retardation following exposure to high but non-lethal temperatures (Adelusi and Lawanson, 1978 …”

Section: Discussionmentioning

confidence: 83%

Effect of Prior Heat Stress on the Early Growth of <i>Carica papaya</i>

Okunlola

Adelusi

2013

Not Sci Biol

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The experiment was carried out to determine the effects of heat stress on some growth parameters like shoot height, leaf area, fresh weight, dry weight as well as the accumulation of chlorophylls in Carica papaya. Seedlings of C. papaya were exposed to prior heat stress at 40 o C. A group of plants was placed in a Gallenkamp oven for four hours; another group of plants was placed in the oven for eight hours while the third group of plants was placed in a dark cupboard for the period of eight hours. Sampling was carried out at weekly intervals starting from seven days after treatment. Plants were randomly picked from each of the three treatments. Three replicates were used for each parameter. The results obtained from the study showed that there was an increment in the shoot height, leaf area, fresh weight and dry weight from the beginning to the end of the experimental period. However, the accumulation of chlorophylls did not follow a particular pattern. The analysis of variance carried out on the data obtained showed that heat stress had a significant effect on the petiole length, shoot height, leaf length, leaf width, leaf area, fresh weight and dry weight. Heat stress, however, did not produce a significant effect on the accumulation of chlorophylls a and b and total chlorophyll.

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Heat-induced changes in dry weight, leaf size and number of chloroplasts per cell in maize and cowpea shoots

Cited by 7 publications

References 11 publications

The Degradation of Chlorophyll — A Biological Enigma

The Degradation of Chlorophyll — A Biological Enigma

Strigolactones Promote Leaf Elongation in Tall Fescue through Upregulation of Cell Cycle Genes and Downregulation of Auxin Transport Genes in Tall Fescue under Different Temperature Regimes

Effect of Prior Heat Stress on the Early Growth of <i>Carica papaya</i>

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