Excised Stem Method for Controlled Pollination of Alfalfa 1

Crop Science ◽  
1963 ◽  
Vol 3 (4) ◽  
pp. 365-366
Author(s):  
William M. Clement
Keyword(s):  
Controlled Pollination

Mechanism of Maize Kernel Setting and Characteristics of Kernel Growth and Development under Controlled Pollination

2011 ◽  
Vol 37 (9) ◽  
pp. 1605-1615 ◽  
Author(s):  
Han-Yu FENG ◽  
Zhi-Min WANG ◽  
Fan-Na KONG ◽  
Min-Jie ZHANG ◽  
Shun-Li ZHOU
Keyword(s):  
Growth And Development ◽  
Maize Kernel ◽  
Controlled Pollination ◽  
Kernel Growth

Intervening in sibling competition for assimilates by controlled pollination prevents seed abortion under postpollination drought in maize

2020 ◽  
Vol 43 (4) ◽  
pp. 903-919 ◽  
Author(s):  
Si Shen ◽  
Xiao‐Gui Liang ◽  
Li Zhang ◽  
Xue Zhao ◽  
Yun‐Peng Liu ◽  
...  
Keyword(s):  
Sibling Competition ◽  
Seed Abortion ◽  
Controlled Pollination

scholarly journals The effect of pollenizer on the fruit set of plum cultivar Cacanska Najbolja

2012 ◽  
Vol 57 (1) ◽  
pp. 9-18 ◽  
Author(s):  
Dragan Nikolic ◽  
Vera Rakonjac ◽  
Milica Fotiric-Aksic
Keyword(s):  
Pollen Germination ◽  
Fruit Set ◽  
Open Pollination ◽  
In Vitro Pollen Germination ◽  
Controlled Pollination ◽  
Very High

In this paper, during a 4-year period (2003-2006) effects of six pollenizers (President, Italian Prune, Stanley, Cacanska Rodna, Agen 707, and California Blue) on the degree of fruit set in the plum cultivar Cacanska Najbolja were examined. Besides the controlled pollination of this cultivar, open pollination was investigated. Functional pollen ability in pollenizer-cultivars was established by in vitro pollen germination. Degree of fruit set was determined comparing the number of fruit set (10 days after pollination, 21 days after pollination and number of harvested fruits) against the number of pollinated flowers. The results indicated that all pollenizer cultivars, studied in this paper, possessed satisfactory in vitro pollen germination (30.1-67.4%). The number of fruit set determined 10 days after pollination was very high and did not differ among pollenizers. Highly significant differences were found between the pollenizers in the number of fruit set 21 days after pollination and significant ones in relation to the number of harvested fruits. Compared to open pollination, higher number of fruit set 21 days after pollination and higher number of harvested fruits were obtained when cultivars Stanley (17.0%; 7.6%) and Italian Prune (14.6%; 6.9%) were used as pollenizers, therefore those cultivars are recommendable as good pollenizers for the cultivar Cacanska Najbolja.

scholarly journals Inbreeding Depression in the Full-sib Offspring of Populus nigra L.

2008 ◽  
Vol 57 (1-6) ◽  
pp. 202-210 ◽  
Author(s):  
V. Benetka ◽  
M. Pospíšková ◽  
F. Vrátný ◽  
M. Tkaczyková
Keyword(s):  
Inbreeding Depression ◽  
Microsatellite Loci ◽  
Growth Traits ◽  
Populus Nigra ◽  
Height Increment ◽  
Open Pollination ◽  
Trunk Diameter ◽  
Controlled Pollination ◽  
Male Tree ◽  
Three Sisters

Abstract Controlled pollination was carried out in the species Populus nigra L. in a greenhouse on isolated branches between sisters and a brother - inbreeding (S x B). Female trees (sisters) were also exposed to open pollination (OP) in the neighbourhood of a male tree (brother) and other Populus nigra trees in the vicinity. The analysis of 11 microsatellites was done in the offspring from the inbreeding (S x B) and from the OP. In OP offspring was found 20-76% of viable individuals that were coming from pollination with brother’s pollen (spontaneous inbreeding). These individuals were separated from the offspring. In a randomised field trial the offspring were evaluated for two years. Fitness decreased in S x B offspring, traits of plant height, trunk diameter, height increment and resistance to Melampsora larici-populina Kleb. were lower in comparison with those of OP offspring. A coefficient of inbreeding depression (δ) ranged from 0.373 to 0.034. The significance of differences between the offspring from S x B and OP of the particular sisters was proved. About 30% of homozygous microsatellite loci were identified in inbred S x B offspring, which was more than in OP offspring. This difference was significant in the offspring of three sisters; it was not significant in the offspring of one sister. This trend corresponded to the results of growth traits.

Onset and duration of stigma receptivity in Kunzea pomifera (Myrtaceae)

2006 ◽  
Vol 54 (6) ◽  
pp. 559 ◽  
Author(s):  
T. Page ◽  
G. M. Moore ◽  
J. Will ◽  
G. M. Halloran
Keyword(s):  
Pollen Tube ◽  
Reproductive Biology ◽  
Peroxidase Activity ◽  
Pollen Tube Growth ◽  
Seed Set ◽  
Stigma Receptivity ◽  
Controlled Pollination ◽  
Germinated Pollen ◽  
New Crop ◽  
Days After Anthesis

The onset and duration of stigma receptivity in K. pomifera was evaluated by observing stigma peroxidase activity, pollen-tube growth and seed set, following controlled pollination of flowers of different ages. Peroxidase activity was negligible from 1 day before to 4 days after anthesis, increasing to a peak of 65% at Day 13. The percentage of pistils bearing germinated pollen and ovaries exhibiting pollen-tube entry increased when pollen was applied to the stigma from the day before anthesis, to a maximum at Days 6 and 7 after anthesis, respectively, followed by a decline by Day 9. Under greenhouse conditions the optimum pollination period, measured as the level of set seed after pollination, ranged from 2 to 11 days after anthesis. The knowledge of this aspect of the species reproductive biology is of considerable value in controlled pollinations for its improvement as a new crop.

Post-pollination capsule development in Eucalyptus globulus seed orchards

2008 ◽  
Vol 56 (1) ◽  
pp. 51 ◽  
Author(s):  
S. Suitor ◽  
B. M. Potts ◽  
P. H. Brown ◽  
A. J. Gracie ◽  
P. L. Gore
Keyword(s):  
Eucalyptus Globulus ◽  
Resource Competition ◽  
Control Treatment ◽  
Seed Orchards ◽  
Controlled Pollination ◽  
Weather Events ◽  
Major Period ◽  
Major Factors ◽  
Pollination Methods ◽  
North Western

Low capsule set is a major factor limiting seed production in Eucalyptus globulus seed orchards. Trials were conducted in E. globulus seed orchards in Tasmania, Australia, to identify the timing of capsule development and abortion, as well as the influence of pollination type, the number of ovules fertilised and weather events on capsule set. Controlled pollination (CP), mass supplementary pollination (MSP), open pollination (OP) and isolated unpollinated control (UP) treatments were performed on 21 genotypes in an orchard in southern Tasmania in 2004–2005 and on six genotypes in a higher-altitude orchard in north-western Tasmania in 2005–2006. No capsules were set in the UP control treatment, and capsule set was significantly lower following CP than OP and MSP. The major period of capsule abortion occurred between 20 and 80 days after pollination for all pollination methods across both sites, coinciding with the period of capsule growth. A positive correlation between the number of fertilised ovules per aborted capsule and the length of time capsules were held on the tree was recorded. Given that capsule abortion occurred during a period of fruit growth and that capsules with the lowest number of fertilised ovules aborted first, it is argued that fertilisation level and the level of resource competition are major factors determining capsule abortion.

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