Abstract
Auxin transport plays a significant role modifying plant growth and development in response to environmental signals such as light and gravity. However, the effect of humidity on auxin transport is rarely documented. It is shown here that the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings). The development of lateral roots in SH-seedlings was greatly enhanced compared with NH-seedlings. Removal of the shoot from SH-seedlings reduced the density of lateral roots, and the application of IAA to the cut stem restored the lateral root density, while the decapitation of NH-seedlings did not alter lateral root development. Phloem-based auxin transport appeared responsible for enhanced lateral root formation in SH-seedlings since (i) the rate of IAA transport from the shoot to the root tip was greater than 3.5 cm h-1 and (ii) naphthylphthalamic acid (NPA)-induced reduction of polar auxin transport in the shoot did not influence the number of lateral roots in SH-seedlings. It is proposed that high humidity conditions accelerate the phloem-based transport of IAA from the leaf to the root, resulting in an increase in the number of lateral roots.
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Claims 8
Claim · model-written summary
IAA transport from shoot to root is accelerated in rice seedlings under saturated humidity compared with normal humidity.
- Taxon
- rice
Oryza sativae0 - Treatment
- saturated humiditye0
- Outcome
- transport of labelled indole-3-acetic acid (IAA) from the shoot to the roote0
- Direction
- acceleratede0
- Comparator
- normal humiditye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings)”
Claim · model-written summary
Lateral root development is greatly enhanced in rice seedlings under saturated humidity compared with NH-seedlings.
- Taxon
- riceOryza sativae0
- Organ / stage
- lateral rootse1
- Treatment
- saturated humiditye0
- Outcome
- development of lateral rootse1
- Direction
- greatly enhancede1
- Comparator
- NH-seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings)”
e1“The development of lateral roots in SH-seedlings was greatly enhanced compared with NH-seedlings”
Claim · model-written summary
Removal of the shoot from SH-seedlings reduced lateral root density in rice.
- Taxon
- riceOryza sativae0
- Treatment
- Removal of the shoote1
- Outcome
- density of lateral rootse1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings)”
e1“Removal of the shoot from SH-seedlings reduced the density of lateral roots”
Claim · model-written summary
Application of IAA to the cut stem restored lateral root density in rice seedlings without a shoot.
- Taxon
- riceOryza sativae0
- Treatment
- application of IAA to the cut steme2
- Outcome
- lateral root densitye2
- Direction
- restorede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings)”
e2“the application of IAA to the cut stem restored the lateral root density”
Claim · model-written summary
Decapitation of NH-seedlings did not alter lateral root development in rice.
- Taxon
- riceOryza sativae0
- Treatment
- decapitatione3
- Outcome
- lateral root developmente3
- Direction
- did not altere3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings)”
e3“the decapitation of NH-seedlings did not alter lateral root development”
Claim · model-written summary
The rate of IAA transport from the shoot to the root tip in rice seedlings was greater than 3.5 cm h-1.
- Taxon
- riceOryza sativae0
- Outcome
- rate of IAA transport from the shoot to the root tipe4
- Value
- greater than 3.5 cm h-1e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings)”
e4“the rate of IAA transport from the shoot to the root tip was greater than 3.5 cm h-1”
Claim · model-written summary
NPA-induced reduction of polar auxin transport in the shoot did not influence lateral root number in SH-seedlings.
- Taxon
- riceOryza sativae0
- Treatment
- naphthylphthalamic acid (NPA)e5
- Outcome
- number of lateral rootse5
- Direction
- did not influencee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings)”
e5“naphthylphthalamic acid (NPA)-induced reduction of polar auxin transport in the shoot did not influence the number of lateral roots in SH-seedlings”
Claim · model-written summary
High humidity is proposed to accelerate phloem-based IAA transport from leaf to root, increasing lateral root number in rice.
- Taxon
- riceOryza sativae0
- Treatment
- high humidity conditionse6
- Compound
- IAAe6
- Outcome
- number of lateral rootse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings)”
e6“It is proposed that high humidity conditions accelerate the phloem-based transport of IAA from the leaf to the root, resulting in an increase in the number of lateral roots”
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