The Effect of Seed Orientation on Germination in a Uniform Environment: Differential Success without Genetic or Environmental Variation

Bosy, J.; Aarssen, Lonnie W.

doi:10.2307/2261413

Cited by 30 publications

(12 citation statements)

References 19 publications

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“…Several studies have reported that seed orientation and sowing position significantly affect the germination and seedling growth attributes in many forest species (Prasad and Nautiyal 2003). For instances, Bosy and Aarssen (1995) reported reduced germination in inverted seeds compared to that in other orientations while Pandey and Khatoon (1999) estimated 80% germination in Sterculia urens seeds sown in vertical position at 2 cm and horizontal position at 4 cm depth. Maximum germination (80%) of Calamus prasinus seeds was recorded in inverted orientation while C. stoloniferus and C. thwaitesii seeds in vertical orientation (Bhat 2011).…”

Section: Introductionmentioning

confidence: 99%

Towards the propagation of a critically endangered tree species Anisoptera scaphula

et al. 2013

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Anisoptera scaphula (Roxb.) Kurz, the tallest tree species in Bangladesh, is critically endangered worldwide due to its poor natural regeneration. This study describes the appropriate regeneration technique for A. scaphula through seed germination and clonal propagation by stem cutting. The fastest and highest germination percentage (65) was observed in dewinged seeds sown inverted orientation with half buried position (T10) followed by dewinged seeds (62.5%) sown horizontally in full buried (T7) and delayed germination with lowest percentage (15) was in control (T0). Optimum initial growth was also shown when seedlings were developed from the seeds under T7. Both winged and dewinged seeds sown vertically in full buried or half buried position produced curved seedlings. However, dewinged seeds sown in horizontal or inverted (winged side down) position produced otherwise i.e., straight seedlings. The highest rooting percentages (63%) and maximum number of root (4.8) per cutting were obtained when one node cuttings treated with 0.8% IBA solution followed by 0.4% IBA in turn affecting for better survival and growth of rooted cuttings in the nursery conditions.

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Section: Introductionmentioning

confidence: 99%

Towards the propagation of a critically endangered tree species Anisoptera scaphula

et al. 2013

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“…as opposed to orientation or germination medium utilized (Chmielewski and Ruit 2002). Further, the total number of achenes that germinated (those with emerged radicles) and the total number of seedlings that became established (those with cotyledon emergence above the agar surface) did not differ significantly (P > 0.05) for achenes sown in any orientation (Bosy and Aarssen 1995). Seedling size was previously shown to be correlated with achene size in inbred S. novae-angliae (Wetmore and Delisle 1939a).…”

Section: Reproductionmentioning

confidence: 77%

“…In one subsequent study, achenes of S. novae-angliae exhibited comparably poor germination when the radicle was pointing vertically downward (10%), in comparison to vertically upward (67%) or horizontal (80%) (Bosy and Aarssen 1995), but not so in another study (77, 79, and 85% respectively) (Chmielewski and Ruit 2002). Orientation did not affect the rate of germination in the former study (Bosy and Aarssen 1995). Median germination time and mean time to germination for achenes of S. novae-angliae sown at different orientations in agar were comparable, but took approximately 2.5 times longer for all orientations when sown on filter paper (Chmielewski and Ruit 2002).…”

Section: Reproductionmentioning

confidence: 93%

“…Only 2% of the achenes oriented with the pappus down germinated, whereas 6% of those oriented with the pappus up did (Rowlee 1893). In one subsequent study, achenes of S. novae-angliae exhibited comparably poor germination when the radicle was pointing vertically downward (10%), in comparison to vertically upward (67%) or horizontal (80%) (Bosy and Aarssen 1995), but not so in another study (77, 79, and 85% respectively) (Chmielewski and Ruit 2002). Orientation did not affect the rate of germination in the former study (Bosy and Aarssen 1995).…”

Section: Reproductionmentioning

confidence: 94%

“…With this arrangement, the embryonic parts are in the most advantageous position for germination to occur (Rowlee 1893), the relationship between germination and seed orientation reflecting differential effects of gravity on the embryo (Bosy and Aarssen 1995). Only 2% of the achenes oriented with the pappus down germinated, whereas 6% of those oriented with the pappus up did (Rowlee 1893).…”

Section: Reproductionmentioning

confidence: 98%

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The biology of Canadian weeds. 125. Symphyotrichum ericoides (L.) Nesom (Aster ericoides L.) and S. novae-angliae (L.) Nesom (A. novae-angliae L.)

Chmielewski¹,

Semple²

2003

Can. J. Plant Sci.

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Description and Account of VariationFor personal use only. CANADIAN JOURNAL OF PLANT SCIENCEwoody, cormoid rootstocks or herbaceous rhizomes, are ascending to erect, 4-9 dm tall, and moderately to densely covered by straight, stiff, sharp, appressed or spreading hairs . In midwestern grasslands the species was reported to produce 50 or more 0.45 m tall stems with a spread of 0.75 m from a basal diameter of 0.15 m (Albertson and Weaver 1944). The lower stem leaves are linear, much longer (up to 6 cm) than wide (up to 7 mm), the widest point above the middle, and are deciduous by flowering. The upper stem leaves are linear or widest above the middle and entire, the largest 10 × 4 mm, spine tipped, moderately to densely covered by straight, stiff, sharp, appressed hairs, the branch leaves similar, many, and reduced, often becoming bracts. The inflorescence is panicled, often pyramidal, with many flowering heads. The peduncles are densely covered with short, soft hairs. Bracts subtending the flowering heads are linear to narrowly lanceshaped, grading into leaves and head bracts, and moderately to densely covered by straight, stiff, sharp, appressed hairs. The flowering heads are bell-shaped, 3-4.5 mm high. The phyllaries (head bracts) occur in 3-4 graduated series, the outer spreading to bent backwards, ciliolate-margined, sparsely to densely covered with firm, stiff hairs, spine tipped, with a diamond-shaped chlorophyllous zone. Rays are 8-20, 3-4.5 mm long, 0.7-1.2 mm wide, and white, rarely blue or pink. The disc corollas are 7-15, 2.5-4 mm long, yellow, becoming brown, somewhat enlarged or expanded, with lobes 0.5-0.6 mm long. Achenes are spindle-shaped, 1.0 × 0.4 × 0.2 mm, broadest near the middle and tapering towards both ends, with the attachment at the narrow end, margins ribbed, each surface with one rib and also nerved, densely covered by stiff, sharp, appressed hairs, with a single pappus whorl about equal in length to the disc corolla (Montgomery 1977;Jones 1978a;Semple et al. 1996). Flowering occurs from mid July to the end of September, rarely October, in the northern portion of the range, including Canadian populations, extending into November in the more southern US populations. For personal use only. CHMIELEWSKI AND SEMPLE -SYMPHYOTRICHUM ERICOIDES AND S. NOVAE-ANGLIAE 1019Chromosome numbers of n = 5 (Delisle 1937; Van Faasen 1963), 2n = 8 (Negodi 1938), 2n = 10 (Löve and Löve 1964Semple 1981), 2n = 20 (Semple et al. 1992, and 2n = 32 (Huziwara 1962) have been reported. Aneuploidy may also be occurring (Semple 1976). We consider the reports of 2n = 8 (Negodi 1938) and 2n = 32 (Huziwara 1962) for S. ericoides to be spurious.The karyotype consists of: pair L1, acrocentric (4.6 µm) with a small satellite on the end of the short arm; pair L2, slightly smaller (4.2 µm) and acrocentric, but without a

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Placing seeds with the embryo pointed down improves deep root growth in winter wheat under soil compaction stress

Li,

Feng,

Duan

et al. 2023

Plant Soil

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The Effect of Seed Orientation on Germination in a Uniform Environment: Differential Success without Genetic or Environmental Variation

Cited by 30 publications

References 19 publications

Towards the propagation of a critically endangered tree species Anisoptera scaphula

Towards the propagation of a critically endangered tree species Anisoptera scaphula

The biology of Canadian weeds. 125. Symphyotrichum ericoides (L.) Nesom (Aster ericoides L.) and S. novae-angliae (L.) Nesom (A. novae-angliae L.)

Placing seeds with the embryo pointed down improves deep root growth in winter wheat under soil compaction stress

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