Inflorescence abscission protein SlIDL6 promotes low light intensity-induced tomato flower abscission

2021 ◽  
Author(s):  
Ruizhen Li ◽  
Chun-Lin Shi ◽  
Xiaoyang Wang ◽  
Yan Meng ◽  
Lina Cheng ◽  
...  
Keyword(s):  
Expression Patterns ◽  
Light Stress ◽  
Low Light ◽  
Functional Conservation ◽  
Regulatory Module ◽  
Cell Wall Remodeling ◽  
Fruiting Plant ◽  
Low Light Stress ◽  
Flower Abscission

Abstract In many fruiting plant species, flower abscission is induced by low light stress. Here, we elucidated how signaling mediated by the peptide INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) controls low light-induced flower drop in tomato (Solanum lycopersicum). We analyzed the expression patterns of an IDA-Like gene (SlIDL6) during low light-induced flower abscission, and used tandem mass spectrometry to identify and characterize the mature SlIDL6 peptide. Tomato knockout lines were created to investigate the in vivo function of SlIDL6. In addition, yeast one-hybrid assays were used to investigate the binding of the SlWRKY17 transcription factor to the SlIDL6 promoter, and silencing of SlWRKY17 expression delayed low light-induced flower abscission. SlIDL6 was specifically expressed in the abscission zone and at high levels during low light-induced abscission and ethylene treatment. SlIDL6 knockout lines showed delayed low light-induced flower drop, and the application of SlIDL6 peptide accelerated abscission. Overexpression of SlIDL6 rescued the ida mutant phenotype in Arabidopsis (Arabidopsis thaliana), suggesting functional conservation between species. SlIDL6-mediated abscission was via an ethylene-independent pathway. We report a SlWRKY17-SlIDL6 regulatory module that functions in low light promoted abscission by increasing the expression of enzymes involved in cell wall remodeling and disassembly.

scholarly journals Prevention of Flower Abscission in Bell Pepper

1991 ◽  
Vol 116 (3) ◽  
pp. 516-519 ◽  
Author(s):  
H.C. Wien ◽  
Yiping Zhang
Keyword(s):  
Fruit Set ◽  
Light Stress ◽  
Stress Conditions ◽  
Bell Pepper ◽  
Reproductive Structure ◽  
Low Light ◽  
Foliar Sprays ◽  
Low Light Stress ◽  
Insight Into ◽  
Flower Abscission

A series of greenhouse experiments was conducted with `Shamrock' bell pepper (Capsicum annuum L.) to gain insight into the flower abscission mechanism and to investigate methods to reduce reproductive structure abscission due to low light intensity. Foliar sprays of STS reduced stress-induced abscission. Application of the synthetic auxin NAA to the ovary substituted for pollination to effect fruit set under nonstress conditions, but did not improve fruit set compared to pollinated controls under low-light stress. Ovary treatment with GA3 and BA either alone or combined with NAA had similar results to NAA treatment alone. Foliar sprays of NAA or CPA also did not improve fruit set under low-light stress conditions. Application of NAA in an aqueous paste to the abscission zone prevented abscission but inhibited fruit growth. Taken together, the results indicate that stress-induced abscission is not prevented by auxin application to the ovary or foliage. The interaction of ethylene and auxin in reproductive structure abscission under stress conditions requires further investigation. Chemical names used: 6-benzylaminopurine (BA), p-chlorophenoxy acetic acid (CPA), gibberellic acid (GA,), silver thiosulfate (STS).

scholarly journals Low Light Stress Influences lower Abscission and Yield of Six Bell Pepper Cultivars

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 586d-586
Author(s):  
H.C. Wien ◽  
A.D. Turner ◽  
R. Nyankanga
Keyword(s):  
New York ◽  
Incident Light ◽  
Light Stress ◽  
Bell Pepper ◽  
Cultivar Differences ◽  
Marketable Yield ◽  
Low Light ◽  
Stress Influences ◽  
Low Light Stress ◽  
Flower Abscission

High temperatures during flowering frequently limit yields of some bell pepper cultivars in New York fields. Previous research has shown that subjecting the plants to low light at flowering can have similar effects. To determine if cultivar differences in flower abscission and yield could be accentuated by such a shade stress, field plots of six cultivars were subjected to 1 week of low light during flowering. Shade cloth tunnels were erected over the plant rows in two experiments, reducing incident light by 80%. Nondestructive abscission counts were taken at the start, and 7 days after the end of a 7-day shade period. Mature green fruit were harvested periodically. Low light stress resulted in 68% and 86% abscission at the first three fruiting nodes in 1992 and 1994, respectively. Cultivars showed differential abscission in unshaded plots, and after shade, producing a significant cultivar: shade interaction. `Ace' showed least abscission and maintained yields with shading; `Camelot' lost nearly all flowers and buds with low light stress, and was reduced by 75% and 91% in marketable yield in 1992 and 1994, respectively. Results indicate that shade stress accentuates abscission susceptibility in bell pepper cultivars. Pepper lines selected for low light tolerance may show promise in resisting flower abscission at high temperature.

scholarly journals Metabolomic indicators for low-light stress in seagrass

2020 ◽  
Vol 114 ◽  
pp. 106316
Author(s):  
L.L. Griffiths ◽  
S.D. Melvin ◽  
R.M. Connolly ◽  
R.M. Pearson ◽  
C.J. Brown
Keyword(s):  
Light Stress ◽  
Low Light ◽  
Low Light Stress

Distinction and characterisation of submergence tolerant and sensitive rice cultivars, probed by the fluorescence OJIP rise kinetics

2009 ◽  
Vol 36 (3) ◽  
pp. 222 ◽  
Author(s):  
Ramani Kumar Sarkar ◽  
Debabrata Panda
Keyword(s):  
Photosynthetic Rate ◽  
Oryza Sativa L ◽  
Indica Rice ◽  
Light Stress ◽  
Elongation Growth ◽  
Rice Cultivars ◽  
Low Light ◽  
Test Parameters ◽  
Fluorescence Characteristics ◽  
Low Light Stress

Rice (Oryza sativa L.) plants experience multiple abiotic stresses when they are submerged. In addition to the effects of submergence on gas exchange, water also creates shading of submerged plants. It is believed that responses to submergence are actually responses to low light stress, although during complete submergence in addition to low light other environmental factors like reduce movement of gases affect the plant growth, and therefore, the consequences of submergence are not always alike to shade. We monitored the extent to which shade and submergence change the plant height, chlorophyll a fluorescence characteristics and CO2 photosynthetic rate in three Indica rice cultivars, namely Sarala, Kalaputia and Khoda, which differed in submergence tolerance. There were both similarities and dissimilarities between the consequence of shade and submergence on rice plants. Under shade conditions, elongation growth was greater in submergence tolerant cultivars than the sensitive cultivar, whereas elongation growth was greater under submergence in sensitive cultivar. The reduction in chlorophyll content, damage to PSII, and decrease in CO2 photosynthetic rate was more notable under submergence than the shade conditions. Our results show that several JIP-test parameters clearly distinguish between submergence tolerant and sensitive cultivars, and responses to submergence among different rice cultivars differ depending on their sensitivity to submergence. There were different interactions between cultivar and shade (~low light) and cultivar and submergence.

Effects of low-light stress on maize ear development and endogenous hormones content of two maize hybrids (Zea maysL.) with different shade-tolerance

2013 ◽  
Vol 33 (14) ◽  
pp. 4315-4323 ◽  
Author(s):  
周卫霞 ZHOU Weixia ◽  
李潮海 LI Chaohai ◽  
刘天学 LIU Tianxue ◽  
王秀萍 WANG Xiuping ◽  
闫志广 YAN Zhiguang
Keyword(s):  
Shade Tolerance ◽  
Light Stress ◽  
Endogenous Hormones ◽  
Low Light ◽  
Ear Development ◽  
Maize Hybrids ◽  
Low Light Stress ◽  
Maize Ear

scholarly journals Leaf Senescence of Postproduction Poinsettias in Low-light Stress

1994 ◽  
Vol 119 (5) ◽  
pp. 1006-1013 ◽  
Author(s):  
J. Lorene Embry ◽  
Eugene A. Nothnagel
Keyword(s):  
Chlorophyll Fluorescence ◽  
Chlorophyll A ◽  
Light Harvesting ◽  
Light Stress ◽  
Chlorophyll B ◽  
Excitation Spectra ◽  
Low Light ◽  
Fluorescence Excitation ◽  
Fluorescence Excitation Spectra ◽  
Low Light Stress

Photosynthetic light harvesting was investigated under low-light stress conditions relevant to the problem of interior longevity of potted ornamental plants. Comparisons of leaf pigment levels and chlorophyll fluorescence excitation spectra were made for `Gutbier V-10 Amy' poinsettia (Euphorbia pulcherrima Willd.), which has poor interior longevity, and `Eckespoint Lilo' poinsettia, which has superior interior longevity. The results show that `Eckespoint Lilo' had higher total chlorophyll content per leaf area and lower chlorophyll a: chlorophyll b ratio than `Gutbier V-10 Amy'. In low-light stress, `Eckespoint Lilo' retained its chlorophyll or even accumulated higher levels than in high light, while `Gutbier V-10 Amy' did not exhibit higher chlorophyll retention in low light. Both cultivars acclimatized to low-light stress by decreasing the chlorophyll a: chlorophyll b ratio, and this acclimatization was evident sooner in younger, outer-canopy leaves above the pinch than in older leaves below the pinch. Both cultivars also increased the chlorophyll: carotenoid ratio in low light. These changes in pigment composition, which were essentially structural changes, were reflected in functional changes in light harvesting, as assessed by measurements of chlorophyll fluorescence excitation spectra.

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