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REGISTRATIONS OF GERMPLASM

Registration of ARS-NLT-SALT and ARS-NLT-SALT/B Saline Tolerant Narrow-Leaf Trefoil Germplasm

^a USDA-ARS, Natl. Forage Seed Production Res. Ctr., 3450 SW Campus Way, Corvallis, OR 97331
^b USDA-ARS, Water Management Research Laboratory, Parlier, CA 93648

^* Corresponding author (steinerj{at}onid.orst.edu)

ARS-NLT-SALT (Reg. no. GP-9, PI 632397) and ARS-NLT-SALT/B (Reg. no. GP-10, PI 632398) narrow-leaf trefoil (Lotus glaber Mill., syn. L. tenuis Waldst. & Kit. ex Willd.) germplasm were developed and released in 2002 by the USDA-Agricultural Research Service (ARS). These materials were developed for their phytoremediation and crop rotation value in saline soil reclamation.

ARS-NLT-SALT and ARS-NLT-SALT/B are germplasm lines developed from the broad-based narrow-leaf trefoil germplasm ARS-1207 (PI 608022) using two cycles of saline condition selection during seed germination followed by intercrossing using honey bee (Apis mellifera L.) pollinators under isolation cages near Corvallis, OR, in 1996 and 2000, respectively. ARS-NLT-SALT was developed using 10 dS m^-1 and 20 dS m^-1 saline solutions made from a stock solution of 446 mM CaCl₂ (dihydrate), 1.3 M NaCl₂, and 30 mM Na₂SO₄ (anhydrous) for the first and second selection cycles, respectively. Equal numbers of seeds were harvested from 14 and 30 plants in the first and second selection cycles, respectively. ARS-NLT-SALT/B was developed as above, except 10 mg L^-1 B was added to 10 and 15 dS m^-1 saline solutions in the first and second selection cycles, respectively. There were 14 and 96 plants used for the two ARS-NLT-SALT/B selection cycles. Seeds were harvested en mass from both isolated increases, tested for saline and fresh water germination percentages, and the results compared with those for the base ARS-1207 population.

The germination percentages for ARS-NLT-SALT, ARS-NLT-SALT/B, and ARS-1207 in the fresh water control were 74, 77, and 80%, respectively. The ARS-1207 base population germinated 11 and 16% in the 20 dS m^-1 and 15 dS m^-1 + 10 mg L^-1 B saline conditions, respectively. ARS-NLT-SALT and ARS-NLT-SALT/B germinated 39 and 37% in their respective saline solution test conditions after two cycles of selection. Under fresh water growing conditions, plants of ARS-NLT-Salt grew erect and exhibited either narrow linear-lanceolate or round-shaped leaflets. ARS-NLT-SALT/B plants grew prostrate and exhibited only round-shaped leaflets. Under saline growth conditions, both ARS-NLT-SALT and ARS-NLT-SALT/B had abundant round-shaped, succulent leaves. ARS-1207 grown under saline conditions grew erect with narrow linear-lanceolate shaped leaflets and was stemmy, not succulent.

Fifteen grams of ARS-NLT-SALT or ARS-NLT-SALT/B are available to each applicant on written request to the corresponding author for as long as supplies last. It is requested that this source of germplasm be appropriately recognized if it contributes to the development of a cultivar or germplasm or is used for other research purposes.

NOTES

Registration by CSSA.

Accepted for publication January 31, 2003.

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