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Group Title: Homestead AREC research report - University of Florida Agricultural Research and Education Center ; SB77-2
Title: Flowering habit and seed production in sweet potato seed nurseries operated year round in South Florida
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Permanent Link: http://ufdc.ufl.edu/UF00067826/00001
 Material Information
Title: Flowering habit and seed production in sweet potato seed nurseries operated year round in South Florida
Series Title: Homestead AREC research report
Physical Description: 4 leaves : ; 28 cm.
Language: English
Creator: Conover, Robert A
Whatley, Booker T
Granberry, Darbie
Agricultural Research and Education Center, Homestead
Publisher: University of Florida, Agricultural Research and Education Center
Place of Publication: Homestead Fla
Publication Date: 1977
 Subjects
Subject: Sweet potatoes -- Seeds -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Robert A. Conover, Booker T. Whatley, Darbie Granberry
General Note: "February 1, 1977."
 Record Information
Bibliographic ID: UF00067826
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 72474409

Table of Contents
    Copyright
        Copyright
    Flowering habit and seed production in sweet potato seed nurseries operated year round in South Florida
        Page 1
    List of Tables
        Page 2
        Page 3
        Page 4
Full Text





HISTORIC NOTE


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
Cooperative Extension Service.






Copyright 2005, Board of Trustees, University
of Florida






SHomestead AREC Research Report SB77-2 February 1, 1977

r Flowering Habit and Seed Production.in Sweet Potato
Seed Nurseries Operated Year Round njhi Floridal

Robert A. Conover, University of Florida Agricu tua''
and Education Center, Homestead, 1lotida.
Booker T. Whatley, Tuskegee Institute, Alabafai /
Darbie Granberry, University of Georgia Extension- s4'ich
Center, Attapulgus, Georgia.
^^A.S.
Orange- and white-fleshed sweet potato cultivars a'd-.dbied *q/ssflc wer established
and trained to trellises in permanent nurseries in 1974 at theAg Lq al Research
and Education Center, Homestead, Florida, for production of true seed f use in a
cooperative breeding program with Tuskegee Institute, Alabama. Sweet potatoes grow
as perennial plants in the Homestead area and the nurseries were operatcd on a year-
round basis. Records were kept on flowering habit and seed production over a two-
year period. Since seed nurseries in most states are operated only during the
spring, summer and fall months, the performance of breeding stocks on a year-round
basis might be of some interest to sweet potato breeders.

There was little difference between the orange-fleshed and white-fleshed stocks in
flowering on a year-round basis. Ten of the 18 orange-fleshed stocks and 8 of the
13 white-fleshed stocks produced flowers every month of the year. However, most
white-fleshed stocks flowered more profusely than did the orange-fleshed lines.
Flowering on 7 of the 13 white-fleshed lines was rated "heavy" over a total of 16
months whereas flowering on only 5 of the 18 orange-fleshed lines was rated as
"heavy" for a total of 10 months. The 3 orange-fleshed stocks which flowered the
best were TI 44-71, NC-289 and 'Goldmar', L9-190 (omitted from Table 1), L7-177 and
S 'Jewel' flowered the least. Among the white-fleshed lines 'White Triumph' flowered
freely throughout the year.with flowering rated as "heavy" for 5 months during the
fall, 'White Bunch' and 'Theodore White' did not flower at all but these cultivars
(and 'Vogel White') were not added to the nursery until 1975. 'Boniato' and 'Nancy
Hall' flowered very little and for a relatively short period. The light flowering
of 'Boniato' when grown on trellises was interesting for this cultivar flowers
freely, at least under some south Florida conditions, when grown on the ground as a
commercial crop.

During the summer months seed matured about 4 weeks after pollination, during the
winter about 5 weeks were required, with some variation among stocks. The sharp de-
clines in seed production in 1975 compared to 1974 were due in most cases to loss of
plants from rot following attacks of the sweet potato weevil. The seed produced
possessed very high quality with germination ranging from 90 to 95% in repeated tests

Although there is no precise way to relate flowering to seed production, it does
appear that they are roughly comparable but there were some interesting exceptions.
For instance, 'Goldrush' ranked about 7th in flowering and 18th in seed production.
In contrast 'Centennial' was about 5th in flowering and 2nd in seed production. When
flowering and seed data are compared with the results obtained from controlled pol-
linations (see AREC Research Report SB77-1) it is apparent that seed production was
related to the compatibility of the female parent. 'Goldrush' was compatible only
with 'Nugget' pollen and then only in 6% of the crosses. 'Centennial' was compatible
with pollen from 7 stocks with the percentage of successful crosses ranging from 21
to 58. High seed production required heavy flowering on a compatible parent.



Presented at the National Sweet Potato Collaborators Conference, Atlanta, Georgia,
February 5-6, 1977. The authors express their appreciation for the excellent
assistance of Joyce Francis and Sara Walker.










Table 1. Flowering periods for orange-fleshed sweet potato cultivars
and breeding stocks, 1974-1976. Symbols used for flowering
rates are: "X" heavy, "x" moderate, "=" light and "-"
occasional.


Stock

TI 44-71

Centennial

Rose Centennial

M 7-21

NC-289

NC-172

Jewel

Red Jewel

Goldmar

Goldrush

Georgia Red

Nugget

Redmar

NC-304

LO-132

L9-163

L7-177


Jul Aug.

=== XXX

=== XXX









--- xxx===





XXX XXX

--- XXX






= XXX


Sept Oct Nov Dec Jan Feb Mar Apr May June

xxx XXX XXX XXX xxx xxx xxx xxx == ===

xxx xxx xxx xxx xxx === xxx xxx

XXX === === === === xxx XXX

xxx xxx xxx XXX xxx XXX XXX XXX ==

xxx XXX XXX XXX xxx xxx xxx xxx === ---

--- xxx === === --- --- ---

--- --- --- --- --- --- --- ---

--- --- --- --- --- --- --- --- --- ===

XXX XXX xxx xxx xxx === = xxx ===

xxx xxx xxx xxx xxx --- ---



--- --- --- XXX ---


XXX XXX xxx xxx xxx ---


S--- xxx xxx ==



--- ===s =XXX == = =
---===xx-------------









J


Table 2. Flowering periods for white-fleshed sweet potato cultivars
and breeding stocks, 1974-1976. Symbols used for flowering
rates are: "X"' heavy, "x" moderate, "="light and "-"
occasional.


Stock* Jul Aug Sept Oct Nov Dec Jan Feb Mar Apr May June

White Triumph xxx XXX XXX XXX XXX XXX xxx xxx xxx xxx xxx xxx

White Centennial xxx xxx xxx xxx xxx XXX xxx === xxx == === xxx

TI 83-73A === === xxx xxx XXX XXX xxx xxx xxx xxx xxx ===

WI 4-716 xxx xxx xxx xxx xxx xxx === xxx xxx XXX xxx xxx

TI 27-71 xxx xxx xxx xxx XXX XXX xxx === === === xxx xxx

Australian Canner === xxx XXX XXX XXX xxx === --- === xxx ---

White Star --- --- xxx xxx XXX XXX === --- === xxx == --

PI 315-343 --- --- === === xxx xxx xxx xxx ==

Tinian --- === xxx xxx xxx xxx =

Vogel White --- --- xxx xxx xxx xxx

Nancy Hall --- === === === === === xxx

Boniato --- --- ==xxx === ---

Pelican Processor === === === xxx xxx xxx xxx === xxx XXX xxx xxx


*lWhite Bunch and Theodore White were included in the planting but did
not flower.












Table 3. Sweet potato seed production in 1974 and 1975.


Orange-Fleshed Stocks White-Fleshed Stocks
No. of Seeds No. of Seeds
Stock 1974 1975 Stock 1974 1975

TI 44-71 2882 1468 White Triumph 32780 19200
Centennial 1630 1293 White Centennial 5297 2100
Rose Centennial 220 319 TI 83-73A 11378 12350
M7-21 323 250 WI 4-716 2035 644
NC-289 1100 363 TI 27-71 5345 5248
NC-172 244 118 Australian Canner 3462 1057
Jewel 61 111 White Star 5510 4209
Red Jewel 100 200 PI 315343 3221 5436
Goldmar 416 508 Tinian 915 511
Goldrush 8 26 Vogel White 643
Georgia Red 106 99 Nancy Hall 181 243
Nugget 73 129 Boniato 9 22
Redmar 280 255 Pelican Processor 3885 7385
NC-304 565 725
LO-132 486 190
L9-163 339 146
L7-177 56 22
L9-190 24 58

TOTAL 8913 6280 TOTAL 74018 59048




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