Heterosis for forage production and quality in Pennisetum interspecific hybrids /
Twenty Pennisetum flaccidum x P. mezianum interspecific hybrids were evaluated and contrasted with the parental lines [Carostan (P1 220606) and PI 315868 (females) and PI 214061 (male)] for forage production, quality, and seed production. Hybrids evaluated had either reduced (n+n) or unseduced (2n+n...
| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
2000.
|
| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=731990331&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Twenty Pennisetum flaccidum x P. mezianum interspecific hybrids were evaluated and contrasted with the parental lines [Carostan (P1 220606) and PI 315868 (females) and PI 214061 (male)] for forage production, quality, and seed production. Hybrids evaluated had either reduced (n+n) or unseduced (2n+n) origin. The study was conducted at Texas A&M University research farm near College Station, TX and yearly forage production was evaluated from 1996 to 1998. A significant (P<0.05) genotype x year interactions was observed for forage yield. In the first year, Carostan hybrids had a higher dry platter production than the PI 315868 hybrids. In the second year, there were no significant differences (P>0.05) between the hybrids and the highest yielding parent. During the third year, the 2n+n hybrids from P1 315868 had a higher yield than the parental lines and were similar to the other hybrids. Forage samples were collected and analyzed for crude protein (CP), neutral detergent fiber (NDF), cellulose (CELL), hemicellulose (HEMI), and lignin (L) concentration. No genotype x year interaction was observed for CP, NDF, HEMI, and CELL. For CP concentration, hybrids were intermediate to the parents. Neutral detergent fiber concentration in hybrids was lower when Carostan (P<0.05) was the maternal parent. The HEMI concentration of all FI hybrids was lower than the maternal lines (P<0.05) but similar to PI 214061 (P>0.05). Cellulose concentration of the PI 315868 hybrids was higher (P<0.05) than those from Carostan and similar (P>0.05) to those from PI 214061 and the n+n hybrids of Carostan. Heterosis was not observed for the n+n hybrids from P1 315868. In 1997 and 1998, the highest mean heterosis was observed in the 2n+n hybrids from the maternal parent PI 315868. Heterosis was not observed for CP, NDF, HEMI and CELL as most hybrids were intermediate to their parents. Seed-set were low in both P. faccidum parents and if all hybrids between P. flaccidum x P. mezianum. Even though good forage production and quality was observed in the hybrids, the lack of good seed production limits their future use as commercial cultivate. |
|---|---|
| Item Description: | Vita. "Major Subject: Plant Breeding". |
| Physical Description: | xi, 80 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 55-62). |