Paper · 2013 · Journal of Agricultural Science

Effects of Enhanced Ultraviolet-B (UV-B) Radiation and Antioxidative-type Plant Growth Regulators on Rice (Oryza sativa L.) Leaf Photosynthetic Rate, Photochemistry and Physiology

Abdul Razack Mohammed; Lee Tarpley

Read at the source ↗doi:10.5539/jas.v5n5p115 ↗OpenAlex W1972595207 ↗In the paper network →

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Abstract

Elevated UV-B radiation deleteriously affects rice yields. The impacts of plant growth regulator (PGRs; ?-tocopherol, glycine betaine [GB] and salicylic acid [SA]) applications on higher plants have been the subject of many studies. However, little or no work has been carried out on rice responses to ?-tocopherol, GB or SA under UV-B stress conditions. This study determined the effects of ?-tocopherol (2.3 kg ha-1), GB (2.0 kg ha-1) or SA (12.9 g ha-1) application on rice leaf photosynthetic rate (PN), photochemistry and physiology under ambient and elevated UV-B conditions. Elevated UV-B decreased PN (17%), quantum yield (8%), electron transport rate (9%), total chlorophyll concentration (8%), plant height (12%), number of leaves (17%), pollen viability (6%), phenolic concentration (46%) and yield (21%). The applications of Alpha-tocopherol, GB or SA increased yield by 23%, 18% and 29%, respectively, under elevated UV-B. Application of PGRs increased leaf phenolic content thus rendering protection against elevated UV-B.

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Claims 1

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Elevated UV-B reduced rice photosynthetic rate by 17%.

Treatment
Elevated UV-Be0
Outcome
PNe0
Direction
decreasede0
Value
17%e0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

t0

“Rice (Oryza sativa L.)”

✓ located verbatim in the source · title, characters 101–123 · show in text ↑
e0

“Elevated UV-B decreased PN (17%), quantum yield (8%), electron transport rate (9%), total chlorophyll concentration (8%), plant height (12%), number of leaves (17%), pollen viability (6%), phenolic concentration (46%) and yield (21%).”

✓ located verbatim in the source · abstract, characters 582–816 · show in text ↑

uv · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results

19 papers: 3 positive, 16 negative or no effect

15 papers in the same direction as this paper · 3 in the opposite direction

  1. negative
    Elevated UV-B eliminated the high-CO2 AQE response in rice.

    Interaction of Elevated Ultraviolet-B Radiation and CO2 on Productivity and Photosynthetic Characteristics in Wheat, Rice, and Soybean · 1990 · compared with high CO(2)

    Same directionCited by this paper

  2. negative
    With simultaneous increases in CO2 and UV-B radiation, the CO2 enhancement effects on respiration, photosynthesis and biomass were eliminated in IR-36.

    CO2 Enhancement of Growth and Photosynthesis in Rice (Oryza sativa) · 1992

    Same directionCited by this paper

  3. negative
    UV-B reduced variable-to-maximum chlorophyll fluorescence yield ratios in rice and pea.

    Effects of Supplementary Ultraviolet-B Radiation on Rice and Pea Plants · 1993

    Same directionCited by this paper

15 papers more in this group

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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.