Latest Research News on Seedling Production: Feb – 2020

Seed Production, Seed Populations in Soil, and Seedling Production After Fire for Two Congeneric Pairs of Sprouting and Nonsprouting Chaparal Shrubs

A study of seed production, seed storage within the soil, and seedling production after fire was undertaken for a sprouting and a nonsprouting congenerica pair of species of Ceanothus and Arctostaphylos. All species exhibited large fluctuations in annual seed production. There was a big correlation between fruit production and precipitation within the previous year. it’s hypothesized that prime carbon gain in years of high precipitation leads to high numbers of floral primordia which, in these species, remain dominant until the subsequent year. it had been also noted that prime fruit production wasn’t dependent upon high precipitation an equivalent year; suggesting that the fruits were utilizing carbon stored from the previous year. All 4 species were capable of manufacturing more seeds during a single season than were stored within the soil. Apparently the soil seed pools don’t represent a gentle accumulation of seeds within the soil but rather are the results of dynamic fluctuations in seed inputs and outputs. [1]

Acorn predation and seedling production in a low-density population of cork oak (Quercus suber L.)

Prospects for Quercus suber recruitment were examined during a scrub-dominated area with low tree density in southern Spain by sowing acorns experimentally during a sort of sites. Seeds placed on the bottom surface were invariably eaten within a couple of months by a spread of vertebrate herbivores (cattle, red deer, Dama dama , boar and rabbits). Predation reached 100% whether acorns were placed beneath trees or quite 100 m faraway from trees. Seeds placed under dense heath scrub were also rapidly removed, although their final fates couldn’t be ascertained. Single acorns buried under open or dense scrub experienced rock bottom predation (52% and 0%, respectively) and had relatively high emergence rates (38% and 60%, respectively). Heavy shoot browsing occurred in both scrub types, and out of the 49 buried acorns which produced a shoot, only two seedlings were alive 1 year after germination. None survived 2 years after sowing. [2]

High Frequencies of Fertilization and Haploid Seedling Production in Crosses Between Commercial Hexaploid Wheat Varieties and Maize

Nineteen commercial hexaploid wheat varieties were crossed with the maize F1 hybrid ‘Seneca 60’. Fertilization frequencies ranged from 32.1 % to 47.5 you look after pollinated florets (mean 39.5 %) within the 14 winter wheat varieties and from 40.7 % to 51.4 % (mean 47.8 %) within the five spring wheat varieties. In some cases only an endosperm was formed and therefore the frequencies of embryo formation were therefore slightly lower, being 28.2 % to 45.9 % (mean 36.4 %) for winter wheats and 39.8 % to 48.6 % (mean 45.1 %) for spring wheats. Mean values were significantly higher within the spring wheats but no significant variation was found between varieties within the spring or winter categories. within the five spring wheats the mean yield of embryos, and hence the potential yield of haploid plants, was 3.4‐fold above with the tetraploid Hordeum bulbosum clone PB179. For the 14 winter wheats the figure was 10.9‐fold higher. These differences were highly significant (p < 0.001) altogether varieties. one 2,4‐D treatment given to spikes at some point after pollination with maize enabled embryos to be recovered from all 19 varieties. [3]

Seed sojourn and fast viability loss constrain seedling production of a prominent riparian protection plant Salix variegata Franch

Salix variegata Franch, a prominent plant applied in riparian shelter vegetation in Three Gorges reservoir region of China, produces many seeds per annum but generates only a couple of or no seedlings. Whether the low seedling production of S. variegata is caused by seed sterility or by rapid loss of seed viability remains unknown. We investigated the sojourn time of mature seeds in capsules produced in early, mid, and late reproductive season and therefore the germinability of mature seeds fresh or stored after different period of your time . The sojourn time of seeds in capsules was 2.89, 3.95, and 4.72 days in early, mid, and late reproductive season, respectively. The maximal germination percentage of non-stored fresh seeds produced in early, mid, and late reproductive season was 93.33%, 78.67%, and 40%, respectively, which indicates mature seeds weren’t sterile. [4]

Different Substrates in Seedling Production of Caesalpinia pyramidalis Tul

The use of native species for the recovery of degraded areas has been of great relevance, however, there’s a deficiency in studies aimed toward the Northeast region of Brazil, which presents one among the most important areas under desertification within the South American continent. The region features a diverse native flora of high cultural and economic relevance like Caesalpinia pyramidalis Tul, popularly referred to as catingueira that stands out for the rusticity and use in diverse areas medicinal, logging, cultural, animal feeding, among others. the target of this work was to guage the consequences of chemical fertilisation on different substrate sources on the emergence and initial growth of Caesalpinia pyramidalis seedlings. For the constitution of the substrates samples, Yellow Oxisol distrocoeso were collected at 0.50 m depth and superfine vermiculite. [5]

Reference

[1] Keeley, J.E., 1977. Seed production, seed populations in soil, and seedling production after fire for two congeneric pairs of sprouting and nonsprouting chaparal shrubs. Ecology, 58(4), (Web Link)

[2] Herrera, J., 1995. Acorn predation and seedling production in a low-density population of cork oak (Quercus suber L.). Forest Ecology and Management, 76(1-3), (Web Link)

[3] Laurie, D.A. and Reymondie, S., 1991. High frequencies of fertilization and haploid seedling production in crosses between commercial hexaploid wheat varieties and maize. Plant Breeding, 106(3), (Web Link)

[4] Seed sojourn and fast viability loss constrain seedling production of a prominent riparian protection plant Salix variegata Franch
Qiaoli Ayi, Bo Zeng, Jianhui Liu, Shaohua Shi, Hangang Niu, Feng Lin & Yeyi Zhang
Scientific Reports volume 6, (Web Link)

[5] Conceição, N. N. G. de M. da, Dias, F. P. M., Paes, Ésio de C., Silva, F. T. dos S., Nóbrega, R. S. A. and Nóbrega, J. C. A. (2018) “Different Substrates in Seedling Production of Caesalpinia pyramidalis Tul”, Journal of Experimental Agriculture International, 27(3), (Web Link)

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