Abstract
The pigment changes that occur during transformation of etioplasts to fully developed chloroplasts have been studied in seedlings of barley (Hordeum vulgare L.) by greening with white light of low (15–25 μmol m−2 s−1) and medium (150 μmol m−2 s−1) intensity. At least 24 h longer was required in the low light regime for the same concentration of pigment to be accumulated in the seedlings. The increase in pigment content was mainly due to the synthesis of chlorophylls a and b. Of the carotenoids present, the increases in the levels of neoxanthin and, especially, β-carotene were much greater than those observed for the other carotenoids. Levels of lutein also increased but this change was small by comparison to those observed for neoxanthin and β-carotene. In the long-term the concentration of violaxanthin remained unaltered although significant transient changes were recorded. The levels of antheraxanthin and zeaxanthin were markedly reduced during greening. The rate of pigment synthesis decreased with increasing cell age, i.e. from the base to the tip of the primary leaf. Overall, carotenoid levels increased by approximately 100% at the base of the seedling but hardly at all at the tip.
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Claims 9
Claim · model-written summary
Low light required at least 24 hours longer than medium light to accumulate the same pigment concentration.
- Taxon
- barley (Hordeum vulgare L.)
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- low light regimee0
- Outcome
- same concentration of pigmente0
- Direction
- longere0
- Value
- 24 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“barley (Hordeum vulgare L.)”
e0“At least 24 h longer was required in the low light regime for the same concentration of pigment to be accumulated in the seedlings.”
Claim · model-written summary
Pigment content increased mainly through synthesis of chlorophylls a and b.
- Taxon
- barley (Hordeum vulgare L.)Hordeum vulgaret0
- Outcome
- pigment contente0
- Direction
- increasee0
- Qualifier
- synthesis of chlorophylls a and be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare L.)”
e0“The increase in pigment content was mainly due to the synthesis of chlorophylls a and b.”
Claim · model-written summary
Neoxanthin and β-carotene increased more than other carotenoids during greening.
- Taxon
- barley (Hordeum vulgare L.)Hordeum vulgaret0
- Outcome
- levels of neoxanthin and, especially, β-carotenee0
- Direction
- increasese0
- Comparator
- other carotenoidse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare L.)”
e0“the increases in the levels of neoxanthin and, especially, β-carotene were much greater than those observed for the other carotenoids.”
Claim · model-written summary
Lutein increased only slightly compared with neoxanthin and β-carotene.
- Taxon
- barley (Hordeum vulgare L.)Hordeum vulgaret0
- Outcome
- Levels of luteine0
- Direction
- increasede0
- Comparator
- neoxanthin and β-carotenee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare L.)”
e0“Levels of lutein also increased but this change was small by comparison to those observed for neoxanthin and β-carotene.”
Claim · model-written summary
Violaxanthin concentration was unchanged in the long term, despite transient changes.
- Taxon
- barley (Hordeum vulgare L.)Hordeum vulgaret0
- Outcome
- concentration of violaxanthine0
- Direction
- remained unalterede0
- Qualifier
- significant transient changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare L.)”
e0“In the long-term the concentration of violaxanthin remained unaltered although significant transient changes were recorded.”
Claim · model-written summary
Antheraxanthin and zeaxanthin levels fell markedly during greening.
- Taxon
- barley (Hordeum vulgare L.)Hordeum vulgaret0
- Outcome
- levels of antheraxanthin and zeaxanthine0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare L.)”
e0“The levels of antheraxanthin and zeaxanthin were markedly reduced during greening.”
Claim · model-written summary
Pigment synthesis rate decreased with increasing cell age from leaf base to tip.
- Taxon
- barley (Hordeum vulgare L.)Hordeum vulgaret0
- Organ / stage
- primary leafe0
- Outcome
- rate of pigment synthesise0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare L.)”
e0“The rate of pigment synthesis decreased with increasing cell age, i.e. from the base to the tip of the primary leaf.”
Claim · model-written summary
Carotenoids increased approximately 100% at the seedling base.
- Taxon
- barley (Hordeum vulgare L.)Hordeum vulgaret0
- Organ / stage
- base of the seedlinge0
- Outcome
- carotenoid levelse0
- Direction
- increasede0
- Value
- approximately 100%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare L.)”
e0“carotenoid levels increased by approximately 100% at the base of the seedling but hardly at all at the tip.”
Claim · model-written summary
Carotenoid levels barely changed at the seedling tip.
- Taxon
- barley (Hordeum vulgare L.)Hordeum vulgaret0
- Organ / stage
- tipe0
- Outcome
- carotenoid levelse0
- Direction
- hardly at alle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare L.)”
e0“carotenoid levels increased by approximately 100% at the base of the seedling but hardly at all at the tip.”
The same questions in other papers
light · physiology: pigments · Hordeum vulgare (barley)Positive and negative results
6 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
12 papers more in this group
See all 16 papers →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.