Abstract
Photosynthesis was measured in excised sporophytes of Polytrichum and Funaria with an infrared gas analyzer. Net photosynthesis was recorded for Funaria, but photosynthesis beyond the compensation point was not demon- strable for Polytrichum. The gametophytes of both genera show net photo- synthesis, and the shapes of the light saturation curves for the gametophytes are similar to those obtained for their respective sporophytes. The distribution of dry weight within the sporophyte was followed during capsule development. In Polytrichum the weight of the seta decreases as the weight of the capsule increases. This is not the case in Funaria. These results establish the importance of seta reserves in the economy of the Polytrichum sporophyte during capsule expansion. Throughout its life, the moss sporophyte remains attached to the gametophyte. It is reasonable to assume that the gametophyte contributes organic compounds to the sporophyte during part or all of the sporophyte's development. The presence of chloro- phyll throughout the young sporophyte (Bold, 1940), and especially in the capsule of the older sporophyte (Haberlandt, 1886), has prompted the question of whether or not sporophytic tissue can contribute to its own nutrition by photosynthesis. This paper is devoted to some preliminary attempts to answer this question by infrared gas analysis for the detection of photosynthesis. MATERIALS AND METHODS
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Claims 7
Claim · model-written summary
Net photosynthesis was recorded in Funaria sporophytes.
- Outcome
- Net photosynthesise1
Verbatim
t0“Sporophytes of Polytrichum and Funaria”
e1“Net photosynthesis was recorded for Funaria”
Claim · model-written summary
Photosynthesis beyond the compensation point was not demonstrable in Polytrichum sporophytes.
- Taxon
- Polytrichum
Polytrichumt0 - Outcome
- photosynthesis beyond the compensation pointe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sporophytes of Polytrichum and Funaria”
e2“photosynthesis beyond the compensation point was not demon- strable for Polytrichum”
Claim · model-written summary
Gametophytes of both genera showed net photosynthesis.
- Taxon
- Polytrichum and FunariaPolytrichumFunariat0
- Organ / stage
- gametophytese3
- Outcome
- net photo- synthesise3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sporophytes of Polytrichum and Funaria”
e3“The gametophytes of both genera show net photo- synthesis”
Claim · model-written summary
Light saturation curves of gametophytes were similar in shape to those of their sporophytes.
- Taxon
- Polytrichum and FunariaPolytrichumFunariat0
- Organ / stage
- gametophytese4
- Outcome
- shapes of the light saturation curvese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sporophytes of Polytrichum and Funaria”
e4“the shapes of the light saturation curves for the gametophytes are similar to those obtained for their respective sporophytes”
Claim · model-written summary
In Polytrichum the seta weight decreased as capsule weight increased.
- Taxon
- PolytrichumPolytrichumt0
- Organ / stage
- setae5
- Outcome
- weight of the setae5
- Direction
- decreasese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sporophytes of Polytrichum and Funaria”
e5“In Polytrichum the weight of the seta decreases as the weight of the capsule increases”
Claim · model-written summary
In Funaria the seta weight did not show the same decrease as capsule weight increased.
Not reportedDirection
Verbatim
t0“Sporophytes of Polytrichum and Funaria”
e5“In Polytrichum the weight of the seta decreases as the weight of the capsule increases”
e6“This is not the case in Funaria”
Claim · model-written summary
Seta reserves are important for the Polytrichum sporophyte during capsule expansion.
- Taxon
- PolytrichumPolytrichumt0
- Outcome
- capsule expansione7
- Qualifier
- seta reservese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sporophytes of Polytrichum and Funaria”
e7“These results establish the importance of seta reserves in the economy of the Polytrichum sporophyte during capsule expansion”